There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators. However, mitigation techniques are available to help limit exposure to the vulnerability.
If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the interface being blocked, transit traffic will not block the interface. Workarounds that mitigate this vulnerability are available in the workarounds section of the advisory.
Cisco has released free software updates that address these vulnerabilities. There are no workarounds that mitigate these vulnerabilities. If "debug ip tcp transactions" is enabled and this vulnerability is triggered, debug messages with connection queue limit reached will be observed.
Conditions CallManager receives an inbound H. CCM closes the outbound H. Because the GW also closed the H. Workaround Disable outbound fast start and this problem will not occur. Symptom MGCP three-way call conferencing may fail because of an abrupt onhook event at the originating endpoint. Workaround None. Symptom Interim record is seen. Call goes through fine but wrong bytes are displayed.
Workaround Disable LZS compression. Symptom Router may install duplicate routes or incorrect route netmask into routing table. It could happen on any routing protocol. Additionally, for OSPF, crash was observed. Symptom H gateways crash under load.
Conditions Multiple H calls were made simultaneously. Workaround Configuring the following CLI should prevent the crash:. Symptom The Watch button is not lit on if no watched phone for this watched DN. Ring back tone is heard when calling to this DN. Conditions No phone, no matter registered or not, is configred with the watched DN. Conditions Using IOS image with feature variable more than 50 characters.
Symptom Traceback observed when configuring credentials CLI under sip-ua. Conditions This happens when user configures credentials CLI with username length more than 32 characters. Symptom There will be traceback on configuring mls qos cos pass-through dscp in supporting interface mode.
Conditions Configuring "mls qos cos pass-through dscp" in the interface that supports the functionality. Workaround Currently, the CLI is not supported in most network modules, and thus, is invisible to the users. Further Problem Description: Due to the buffer overflow, there will be traceback when configuring the QoS in the supporting interface.
Currently, the CLI is not supported in most network modules, and thus,is invisible to the users. Conditions This problem should not affect most mail clients because Cisco is not in violation of any specifications.
Symptom router crashes due to signal Conditions Crash happens while transfering calls. Symptom Periodical crashes on with CME features. Conditions When "callmonitor scan" is configured. Workaround Turned off "callmonitor scan". DNS engine. This vulnerability may cause a router to crash or hang, resulting in a denial of service condition. There is a workaround for this vulnerability.
Workaround There is no workaround. The rest of the file systems have no problem i. Conditions Load routers with problem releases. Symptom Once policy map is configured and bandwidth is exceeded while dividing amongst the classes, re-configuration of the policy map is not possible. Conditions Create a policy map, exceed the bandwidth amongst the classes e. Workaround Don't exceed the bandwidth while configuring the policy map.
Workaround Create a view that excludes the ipRouteTable:. This view restricts the objects that the NMS can poll. Symptom A router may crash when you configure an access control list ACL that has at least ACEs about nodes that is used in policy maps that are already applied to an interface or when you boot the router after having made the configuration change.
The router keeps dropping SNMP packets. The log shows that the packets are dropped because of the input queue being full. Although the utilization is sometimes high, this could not be the root cause, as the router keeps dropping packets regardless of the current utilization. Apply this view to the RW community string. Symptom Transparent bridging into DLSw does not work. The following messages are displayed:. Workaround For a workaround, all transparent bridging commands related to dlsw can be replaced with DLSW Ethernet redundancy.
After this much time has passed, polling the rttmon mib for the probe statistics will cause the router to reload. Then the problem will not be seen again for another 72 weeks.
Symptom Device running Workaround There is none. This error message can be verified in show logging output. Conditions ip http server is configured. Workaround Configure no ip http server. The switch functionality is not affected by this error message. The problem is cosmetic. Workaround Use H Faststart. If incoming H calls need to be slow-start for video calls and calls to voicemail need to be faststart, enable H. Conditions 1. Conditions This is seen on a router running Symptom EM login username and password may be set to random values in process stack in case the actual input from the phone is in an invalid format.
Once they are in this stuck state, an incoming call to them will not ring the line, there will be no output in debug vpm sig. The problem is likely to occur when the pots leg is disconnected before the voip leg. If this occurs the port can go into this "stuck" state.
Any subsequent calls will not ring the fax machine on this port. Removing the SCCP config from the ports will prevent it from happening too. In this type of attack, a malicious user can cause the IOS DNS server to accept a forged answer that associates a name with an IP address chosen by the malicious user.
This answer ends up in the cache of the DNS server. Conditions The above symptom is seen on a router loaded with The use of bit 0x20 in DNS labels to improve transaction identity is also recommended. This is a security issue. Symptom A busy tone is not heard when a message is received before a 4xx busy message. The bug affects both Workaround A patch is required, forcing the media off when a busy message is received. Successful exploitation of this vulnerability may result in the execution of arbitrary code or a Denial of Service DoS condition on an affected device.
Symptom CFwdAll incorrectly appears after night service is disabled. On the same dn as CFwdAll was on, night service is enabled and disabled. Workaround Remove CFwdAll via softkey or reload the router. Symptom Ping fails over the atm interface while applying Quality of Service. Conditions When we configure the qos on ATM interfaces on the back to back connected routers the ping fails. Conditions If voice codecs are the same, but DTMF relay settings are different then no transcoding is done.
But when voice codecs are different then transcoding is invoked, and DTMF is transcoded from rtp-nte to in-band. Symptom After security is enabled locale in the phone cannot be changed.
Conditions Customer cannot leave security enabled and configure their locale on Cisco and Cisco do not present the issue as they have the firmware locally stored flash. Symptom When an ephone hunt-group is configured with 'present-call idle-phon', the ephone hunt-group skips the DNs which are configured as overlay. Conditions The problem is observed under the following conditions:.
Workaround Remove the 'present-call idle-phone' configuration from the ephone-hunt configuration and do not use overlaying. Symptom Wireless IP phone does not download the tones. So phone cannot generate the query for the relevant network locale file. Workaround Complete the following steps to resolve the problem:.
Along with User defined, we also need to define inbuilt network locale. For example:. Do not run 'create cnf-file' as it will again override with the system defined parameters. Reboot the wireless phone. In case if you have issue in 'create cnf-file', then ensure to repeat all the steps mentioned above again. Symptom Answering a trunk call transferred from another phone is automatically put on hold and cannot be resumed.
Conditions The call originally came in on a trunk dn and is transferred to another extension on a phone sharing that trunk. Trunk optimization takes place. Symptom does not show the parked number when the call is parked. Extension-A completes the transfer by pressing transfer button.
The SIP trunk dial-peer has same destination pattern as pots dial-peer, and pots dial-peer needs to have preference lower than SIP trunk dial-peer. Workaround Use "supplementary-service sip refer" or remove pots dial-peer with same destination pattern or make SIP trunk dial-peer preference lower than pots dial-peer. Symptom One way audio after transfer. Workaround Try to use same codec. Symptom Wrong primary-phone observed after re-configure primary-dn of the ephone.
Conditions Wrong primary-phone observed after re-configure primary-dn of the ephone. Symptom and phones going into DND mode in Connected state. Conditions User getting incoming call on and phones.
Since the softkeys do not update fast, if the user presses DND immediately after going into connected state then after going onhook the user phone would stuck in DnD mode.
Conditions The problem exists in Symptom External caller gets transferred from CUE to an internal DN number, and the ringback sent to the caller is distorted because of jitter. Symptom Jitter or voice quality issue may occur. Conditions If there are a lot of ephones, say there are 50, monitoring same park DN, there will be same sccp messages sent to these 50 phones respectively in few mili seconds. Symptom Version Aug 14 T5 image.
Workaround None. Symptom VG endpoint does not connect to callback destination, once the callback destination is idle. Conditions Multi node cluster and VG endpoint is registered with node other then the first node in the cluster.
Workaround Have VG endpoints registered with first node. Further Problem Description : The activation of the callback is successful. What fails is when the callback destination becomes idle again and the VG endpoint gets notified ring. After the VG endpoint goes offhook, the system should automatically connect to the Callback destination. This does not happen and VG endpoint gets silence. By manipulating the state of a TCP connection, an attacker could force the TCP connection to remain in a long-lived state, possibly indefinitely.
If enough TCP connections are forced into a long-lived or indefinite state, resources on a system under attack may be consumed, preventing new TCP connections from being accepted.
In some cases, a system reboot may be necessary to recover normal system operation. To exploit these vulnerabilities, an attacker must be able to complete a TCP three-way handshake with a vulnerable system.
This additional vulnerability was found as a result of testing the TCP state manipulation vulnerabilities. Cisco has released free software updates for download from the Cisco website that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available. Cisco has released free software updates that address this vulnerability. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory.
The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, , or earlier. This vulnerability could allow valid users to retrieve or write to any file on the device's file system, including the device's saved configuration and Cisco IOS image files, even if the CLI view attached to the user does not allow it.
This configuration file may include passwords or other sensitive information. Devices that are not specifically configured to enable the Cisco IOS SCP server, or that are configured to use it but do not use role-based CLI access, are not affected by this vulnerability. There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators. However, mitigation techniques are available to help limit exposure to the vulnerability.
If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the interface being blocked, transit traffic will not block the interface. Conditions Cisco has released free software updates that address this vulnerability.
Workaround Workarounds that mitigate this vulnerability are available in the workarounds section of the advisory.
This caveat does not affect the functionality. This behavior is seen only in the c, c, c, c, c, c, c, c, and as platforms. Symptom Loopback remote payload failed for routers. Workaround There is no workaround. Conditions Occurs when large ping packets greater than bytes are sent to back-to-back cellular interfaces with GRE tunneling enabled. Symptom Traceback is generated during boot up. Conditions This is caused when the channel-group serial interface is configured with ip-address or np- ip-address.
Symptom The router hangs when attempts are made to modify pure ACL configuration while traffic is still flowing. The router returns back to normal if the traffic is stopped.
Alternate Workaround: Configure static ARP on the router for the helper-address pointing towards the next hop. Symptom crypto isakmp key cli parser mode breakage. Further information: Not service impacting. Symptom Router crashes when stcapp is disabled, stcapp ccm-group is removed from configuration, and then stcapp is re-enabled.
The Unrestricted Display configuration defines a set of attributes that describe the message display option of the ephone. Unlocked Meet-me conference allows the user to unlock the Meet-me conference bridge. All DN tags with the same number should be configured as unlocked. Unlocking the Meet-me conference bridge can allow unrestricted and uncontrolled access for external callers.
This feature is supported only for Meet-me conference. This feature allows This feature offers the following benefits:. This service combination offers a real-time channel dedicated to Voice over IP VoIP traffic, and a second channel that delivers best-effort Internet service.
In the current release, all traffic is marked with an This is implemented using VLAN-based service differentiation. MLPP service allows validated users to place priority calls, and if necessary, to preempt lower-priority calls. The MOH enhancement allows you to configure up to five additional media streams supplied from multiple media files stored in a router's flash memory and eliminates the need for separate routers for streaming MOH media files.
Callers to the extension numbers configured under the MOH groups can listen to different MOH media streams when they are placed on hold. For more information, see:. The MOH enhancement allows you to configure up to five additional media streams supplied from different media files stored in a router's flash memory and eliminates the need of separate routers for streaming multiple MOH media files.
Automatic configuration is not supported on IMA groups. Once a group is automatically configured, no other group can be created. All manually created groups must be deleted before creating an automatic configuration group.
For details about enabling this feature, see the encap clear-channel standard and voice-class sip encap clear-channel commands in the Cisco IOS Voice Command Reference :. Support for resetting the Expires timer upon receipt of SIP message so that when the terminating device lacks answer supervision or does not send the required SIP OK message within the timer expiry, you can enable this feature to send periodic SIP messages to reset the Expires timer and preserve the call until final response.
Support for stripping off progress indicator PI from incoming Q. Configuration of this feature determines whether an incoming Q. This behavior allows interworking with third-party SIP and H. The ITU-Y. This feature allows the Cisco Unified Border Element interwork between different dynamic payload type values across the call legs for the same codec. No further DDTS will be committed to this branch. The migration path for this release is Affected devices would need to be configured to process SIP messages for these vulnerabilities to be exploitable.
Cisco has released free software updates that address these vulnerabilities. There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerabilities. Symptom After launching a flood of random IPv6 router advertisements when an interface is configured with ''ipv6 address autoconf'', removing the IPv6 configuration on the interface with ''no ipv6 address autoconf'' may cause a reload.
Other system instabilities are also possible during and after the flood of random IPv6 router advertisements. Conditions Cisco IOS is configured with ''ipv6 address autoconf''. Workaround Not using IPv6 auto-configuration may be used as a workaround. Note Cisco IOS checks for the hop limit field in incoming Neighbour Discovery messages and packets received with a hop limit not equal to are discarded.
Symptom Router drops valid packets, causing SIP call to fail. We can also see crashes on the Standby router if the Active interface is brought up. Workaround There is no workaround. Symptom A Cisco router may face ping failure between provider and customer networks. Symptom With Reverse Route Injection RRI configured with the reverse-route command, if the crypto map is applied to a multi-access interface for example, ethernet , then egress traffic may fail when the router cannot populate an ARP entry for the crypto peer address.
Conditions The symptom could occur when the upstream device does not support proxy arping. Symptom The H. Symptom Certain crafted packets may cause a memory leak in the device in very rare circumstances. Workaround Disable SIP if it is not needed. Symptom The VTP feature in certain versions of Cisco IOS software is vulnerable to a locally exploitable buffer overflow condition and potential execution of arbitrary code. Conditions The packets must be received on a trunk enabled port, with a matching domain name and a matching VTP domain password if configured.
The first vulnerability is in the translation of Session Initiation Protocol SIP packets, the second vulnerability in the translation of H. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory.
Advisory Bundled Publication at the following link:. Repeated attempts to exploit this vulnerability could result in a sustained denial of service DoS condition. Cisco has released free software updates that address this vulnerability. The H. There are no workarounds to mitigate these vulnerabilities other than disabling H. Two separate Cisco Security Advisories have been published to disclose the vulnerabilities that affect the Cisco Unified Communications Manager at the following locations:.
Conditions When outgoing call is done using queuing-dn. Symptom Router crashes or spurious memory access can be seen. Symptom A Cisco UC crashes with memory corruption and frozen console access. Workaround Power-cycle the router. This symptom will not occur after the image has been upgraded.
Symptom Router crash when configured as mobile router with IP phone attached. Conditions SRST router running This is the first image with sccp version 17 support for SRST.
Workaround Download the IP phone firmware to a version that does not use sccp version Conditions If there are more than 42 buttons configured on the phone, some line buttons may be missing after the phone fails over to the SRST. Workaround Downgrade the phoneload to sccp v16 or lower. Symptom The IOS messages could be observed. Conditions The symptom could happen under normal condition. Workaround Remove the split tunnel configuration. Symptom FXO ports can get stuck in offhook state.
Conditions The symptom is observed when FXO ports are members of a huntgroup where the first member port is disconnected or down. The trunkgroup has max-retry configured and rapid calls are connected and disconnected using the trunkgroup. Workaround Unconfigure max-retry. Under each port, configure timeouts power-denial 0" so that disconnected ports are moved to offhook state and will not be hunted. The output is different compared to the value received from the same configuration on and Workaround Use reset instead of restart.
Symptom 69xx phones display toast message "From : XXXX" when it receives an incoming call for 6 seconds and then it displays the caller ID of the person. Conditions Observed for 8. Workaround Not seen for phone firmware 8. Symptom The Update method would have two call-info headers in certain call scenarios. This would cause the caller ID information to be "unknown" when the two headers were present.
Conditions Under certain call scenarios, the Update method would have two call-info headers, one for normal remotecc info and one for security status. Workaround There is no workaround but it is not service effecting. Caller ID would be unavailable in certain instances. Symptom CME group pickup or pickup features do not work properly. Symptom A monitor phone can change the monitored dn SNR number via myphoneapp application. Conditions Using myphoneapp on a monitoring phone can change the SNR target of a monitored dn.
Symptom AnyConnect Client version 2. AnyConnect 2. This only pertains to the 2. Workaround Any of the following workarounds may be used:. The TCP sessions could be a telnet or H.
Symptom SPAG2 phone would not register. Symptom No line or speed dial buttons are shown on the fallback skinny phone. Workaround Attach side cars to the phone. Workaround Issue clear crypto isa. Symptom When using the copy ftp command to update IOS software issued on a router, it takes approximately 80 seconds before the file transfer begins.
Conditions This is seen on a or series router, but is not seen on routers in other series, such as or Conditions This symptom is observed if a WAN outage happens when more than 40 calls are in progress. Some random calls are then shown to be active when using the command show call active voice compact with Cisco IOS Release Symptom NULL is accepted as a name for class-maps and policy-maps.
No error message is displayed. Conditions Create a class-map or policy-map with "" or " " or any other similar combination as the name. Symptom Failed to get media source address for a stream in a DO call.
Conditions Failed to get media source address for a stream in a DO call with rsvp. Symptom When using mgcp dtmf-relay type nte-gw, a sniffer trace will reveal that digits are sent both in-band within the audio stream and out-of-band dtmf-relay.
Because of this, double digits can be seen in Unity and MeetingPlace. Workaround Use mgcp dtmf-relay type out-of-band. Symptom If a certificate map is changed or added to the trustpoint, the pub key cache for the peers is not cleared. This makes it possible for a client which was connected in the past to reconnect again even if its certificate was banned by the certificate map.
Conditions Only seen with IE8. Workaround IE6 can be used as a workaround.
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