Note If you have an account on Cisco. To reach the Bug Toolkit, l og in to Cisco. This section describes only severity 1 and 2 caveats and select severity 3 caveats. Symptoms: V. Conditions: This symptom is observed on V.
High-speed modem connections V. The successful exploitation enables an adversary to reset any established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases, a user will have to repeat the action for example, open a new Telnet or SSH session. Depending upon the attacked protocol, a successful attack may have additional consequences beyond terminated connection which must be considered. This attack vector is only applicable to the sessions which are terminating on a device such as a router, switch, or computer and not to the sessions that are only passing through the device for example, transit traffic that is being routed by a router.
In addition, this attack vector does not directly compromise data integrity or confidentiality. All Cisco products which contain TCP stack are susceptible to this vulnerability. Symptoms: A router may reload unexpectedly because of a bus error when it accesses a low address during the translation of TCP port Symptoms: A router may reload unexpectedly after it attempts to access a low memory address.
Conditions: This symptom is observed after ACLs have been updated dynamically or after the router has responded dynamically to an IDS signature. Symptoms: A caller doing a blind transfer sees the error message, "Unable to transfer" on their IP phone even though the destination is ringing. This might affect the interoperablity between a call manager and IPIP gateway. Symptoms: A voice gateway incorrectly matches the wrong outbound dial-peer using called number digits collected from INFO messages.
The dial-peer mismatch occurs when the initial interdigit timeout expires because incorrect called number digits are used to find a matching dial-peer. Conditions: This happens when the enhanced default application is used on the terminating gateway and the terminating gateway receives a PROGRESS message with an inband progress indicator.
Workaround: Configure the "default. Cisco products running IOS contain vulnerabilities in the processing of H. A test suite has been developed by the University of Oulu to target this protocol and identify vulnerabilities. Support for the H. The vulnerabilities can be exploited repeatedly to produce a denial of service DoS. There are workarounds available that may mitigate the impact, but these techniques may not be appropriate for use in all customer networks.
Symptoms: Ringback is not heard on the originating phone when a blind transfer is initiated. Once the call is established with the destination, the destination party transfers the originating party to another destination. During this transfer, the originating party should hear the ringing for the destination. Symptoms: A Cisco router that has a voice feature such as H.
Conditions: This symptom is observed on a Cisco series but may also occur on other routers. Workaround: Turn off "ip nat service hall" or move to This should make the router send RSIP:restart to the call agent. Further Problem Description: A call setup without an incoming call leg results in a H. Enter set callinfo newguid to force the call setup to generate new conferenceID and callIdentifier fields. This assumes that the generated GUID does not affect the billing system or the remote endpoint.
The symptom occurs when the following debug privileged EXEC commands are enabled:. Symptoms: Onboard framer misses the first FDL request. PRM transmission to CO timing is wrong. After that, the Cisco IAD operates correctly. Conditions: On the terminating gateway's TGW incoming dial-peer configuration, define a progess indicator for the connect event by using progress-ind connect enable 8. Symptoms: The user is disconnected without any busy tones when transferred to unreachable destination.
Instead it hears a fastbusy and displays unknown number. Conditions: This behavior can occur when the transferee and transfer-to endpoints are attached to the same gateway and the transfer is committed during alerting.
Symptoms: The remote party display information is not updated properly after a call transfer. IP Phone B1 correctly displays "Private. IP Phone A2 answers. On IP Phone A1 there are 2 displays:. To IP Phone B1. On pressing transfer:. Conditions: This behavior occurs when the default session application is set to process the call.
Workaround: Configure the application session command on the incoming dial-peer. Symptoms: The ringback tone provided during alerting and the fast busy tone provided at the end of the call is not as per the cptone configured on the gateway under the voice-port.
A rare sequence of crafted IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the input queue is full. No authentication is required to process the inbound packet. Processing of IPv4 packets is enabled by default. Devices running only IP version 6 IPv6 are not affected. A workaround is available. Symptoms: Caller reaches original destination's voicemail when forwarded-to destination is not available.
Conditions: If a call is forwarded across multiple IP phones, the voicemail box selected is that of the orig called number. For example: A calls B and the call is forwarded to C. C does not answer and the call gets forwarded to B's voice mail instead of C's voicemail.
Symptoms: The Release Sources reported in the radius accounting record or the gateway's call history record for the incoming and outgoing legs don't match.
This behavior does not affect the voice call. Conditions: This behavior may occur when the default voice application handles the incoming call. Workaround: Configure the application default. Symptoms: The wrong cause value is provided when transferring a call to an unallocated or busy destination.
Conditions: This behavior can occur when an incoming call VoIP call is handled by the app-htransfer. The gateway places an outbound VoIP call instead of disconnecting the incoming call with the appropriate cause code under the following two conditions:.
In this case, the final cause value returned to the incoming call depends on the outgoing call setup request. Symptoms: Transfer-with-consultation does not work properly with ITS. Blind transfer still works. Workaround: Disable transfer-with-consultation on the ITS when handling the phone.
Use blind transfer only with the phone in ITS. Conditions: These symptoms are observed when the following two conditions occur:. The line rate is the maximum speed allowed by the digital subscriber line access multiplexer [DSLAM]. Further Problem Description: The show interface atm command indicates the 'packets input' counter not incrementing but the show controller atm command indicates the 'Total Rx' counter is incrementing.
Symptoms: For users using an NM-HDA FXS voice-port, if user picks up the phone during the ring-on cycle, user will hear a high pitch sound distorted ringing until ring-off. If user picks up the phone during the ring-off cycle, this problem will not occur. Workaround: Configure the application session. Symptoms: The gateway may reload when an IP phone transfers a call. Symptoms: The ringback tone provided during alerting, and the fast busy tone provided at the end of the call is not as per the cptone configured on the gateway under the voice-port.
Symptoms: Changing a Routed port back to a L2 port causes a serial interface to be left configured with the IP unnumbered command while the routed port interface no longer exists. Then change back the routed port to L2 port switched port. Symptoms: Incomplete Storm control CLI will switch configuration mode to global mode rather than per port Storm control configuration mode.
Conditions: Configuring the no storm-control command in interface configuration mode. Workaround: Use the no storm-control broadcast unicast multicast command instead of just the no storm-control command in interface configuration mode. Symptoms: Routed port does not fast-wswitch IP traffic although router is configured for IP fast-switching.
Symptoms: Output of the show isdn status command doesn't display the isdn status information of all the isdn interfaces. Conditions: The problem appears only when one of the interfaces is configured with a switch type of primary-dpnss.
Symptoms: Routed port converted back to L2 switchport and used as stacking partner retains OSPF configuration as seen in show ip ospf interface. Conditions: Change a routed port to L2 switchport without explicitly removing IP address. Symptoms: Fails to bring link UP UP when configured to speed 10 and adjacent router's on-board fe is configured to speed auto.
Also displays wrong message about the link changing state to UP UP. The PGW does not do anything, and no call trace is created. Either the PGW does not handle the virtual call or the packet is misformed. Symptoms: Router unexpectedly reloads when pri-group is unconfigured on the controller using the no pri-group timeslots command.
Symptoms: A Cisco series may unexpectedly reload with messages similar to the following:. The following sections describe the documentation available for the Cisco Cisco XM series and Cisco modular access routers. These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, and other documents. Documentation is available as printed manuals or electronic documents.
Use these release notes with these documents:. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set. Cisco IOS software is packaged in feature sets that are supported on specific platforms.
To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature. Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.
You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common. Each module in the Cisco IOS documentation set consists of one or more configuration guides and one or more corresponding command references. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples.
Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference. On Cisco. These electronic documents may contain updates and modifications made after the paper documents were printed. From Cisco.
The following sections provide sources for obtaining documentation from Cisco Systems. You can submit comments electronically on Cisco. In the Cisco Documentation home page, click the Fax or Email option in the "Leave Feedback" section at the bottom of the page. You can submit your comments by mail by using the response card behind the front cover of your document or by writing to the following address:.
For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, the Cisco Technical Assistance Center TAC provides hour-a-day, award-winning technical support services, online and over the phone.
If you do not hold a valid Cisco service contract, please contact your reseller. The Cisco TAC website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The Cisco TAC website is available 24 hours a day, days a year.
For a list of the software caveats that apply to Release The online caveats document is updated for every maintenance release and is located on and the Documentation CD. Synched to technology version Each feature set contains a specific set of Cisco IOS features.
Release Caution The Cisco IOS images with strong encryption including, but not limited to, bit [3DES] data encryption feature sets are subject to United States government export controls and have limited distribution. For descriptions of existing hardware features and supported modules, see the hardware installation guides, configuration and command reference guides, and additional documents specific to the Cisco routers, which are available on Cisco.
This URL is subject to change without notice. If it changes, point your web browser to Cisco. The following sample output from the show version command indicates the version number.
The Cisco IOS software is packaged in feature sets consisting of software images, depending on the platform. Each feature set contains a specific set of Cisco IOS features. Release For example, " If a cell in this column is empty, the feature was included in a previous release or in the initial base release.
Note These feature set tables contain only a selected list of features, which are cumulative for Release Note The following benefits assume a full-featured enterprise router is in use instead of merely using the Cisco cable modem HWIC as a bridge.
Caveats describe unexpected behavior or defects in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels. This document lists severity 1 and 2 caveats; the documents are located on Cisco.
Note If you have an account on Cisco. To reach the Bug Toolkit, l og in to Cisco. If the defect that you have requested cannot be displayed, this may be due to one or more of the following reasons: the defect number does not exist, the defect does not have a customer-visible description yet, or the defect has been marked Cisco Confidential.
Symptom Malformed SSH version 2 packets may cause a memory leak, causing the platform to operate under a degraded condition. Under rare circumstances, the platform may reload to recover itself. Workaround As an interim solution until the affected platform can be upgraded to a Cisco IOS software image that contains the fix for caveat CSCse, configure SSH version 1 from the global configuration mode, as in the following example:.
Symptom A router that is running RCP can be reloaded by a specific packet. Conditions This symptom is seen under the following conditions:. Use another protocol such as SCP.
In order to trigger these vulnerabilities, a malicious client must send malformed packets during the SSL protocol exchange with the vulnerable device. Successful repeated exploitation of any of these vulnerabilities may lead to a sustained Denial-of-Service DoS ; however, vulnerabilities are not known to compromise either the confidentiality or integrity of the data or the device.
These vulnerabilities are not believed to allow an attacker will not be able to decrypt any previously encrypted information. Cisco IOS is affected by the following vulnerabilities:.
Cisco has made free software available to address these vulnerabilities for affected customers. There are workarounds available to mitigate the effects of these vulnerabilities.
Note Another related advisory has been posted with this advisory. This additional advisory also describes a vulnerability related to cryptography that affects Cisco IOS. A combined software table for Cisco IOS is available to aid customers in choosing a software releases that fixes all security vulnerabilities published as of May 22, A vulnerability has been discovered in a third party cryptographic library which is used by a number of Cisco products.
Due to the nature of the vulnerability it may be possible, in some cases, to trigger this vulnerability without a valid certificate or valid application-layer credentials such as a valid username or password. The vulnerable cryptographic library is used in the following Cisco products:. Cisco has made free software available to address this vulnerability for affected customers.
There are no workarounds available to mitigate the effects of the vulnerability. Note Note: Another related advisory is posted together with this Advisory.
It also describes vulnerabilities related to cryptography that affect Cisco IOS. This occurs typically in the following inter-autonomous system scenario:. Workaround Use a configuration such as the following to remove extended communities from the CE router:.
Conditions This problem affects the following IOS releases:. Workaround There are no workarounds. Further Information: The crash occurs in Quick Mode which means that phase 1 must have been completed, which requires knowledge of the pre-shared key or having a valid certificate depending on IKE phase 1 configuration. Conditions The packets must be received on a trunk enabled port. Further Information: On the 13th September , Phenoelit Group posted an advisory containing three vulnerabilities:.
Cisco's statement and further information are available on the Cisco public website at:. Symptom Cisco devices running an affected version of Internetwork Operating System IOS which supports Session Initiation Protocol SIP are affected by a vulnerability that may lead to a reload of the device when receiving a specific series of packets destined to port There are no known instances of intentional exploitation of this issue.
However, Cisco has observed data streams that appear to be unintentionally triggering the vulnerability. Workaround Workarounds exist to mitigate the effects of this problem on devices which do not require SIP. These include:. TCP signature engine may cause a router to crash resulting in a denial of service.
There are mitigations and workarounds for these vulnerabilities. Symptom Malformed SSL packets may cause a router to leak multiple memory blocks.
Conditions This symptom is observed on a Cisco router that has the ip http secure server command enabled. Workaround Disable the ip http secure server command. To exploit this vulnerability an offending IPv6 packet must be targeted to the device.
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