Summary
Affected Products
Details
Impact
Software Versions and Fixes
Obtaining Fixed Software
Workarounds
Exploitation and Public Announcements
Status of This Notice: INTERIM
Distribution
Revision History
Cisco Security Procedures
New vulnerabilities in the
OpenSSH
implementation
for SSH servers have been announced.
An affected network device, running an SSH server based on the OpenSSH implementation, may be vulnerable to a Denial of Service (DoS) attack when an exploit script is repeatedly executed against the same device. There are workarounds available to mitigate the effects of these vulnerabilities.
This advisory will be posted at http://www.cisco.com/warp/public/707/cisco-sa-20030917-openssh.shtml.
The following products, have their SSH server implementation based on the OpenSSH code, and are affected by the OpenSSH vulnerabilities.
Cisco has not released code with SSH for the SN5420 storage router.
The following products, which incorporate a SSH server, have been confirmed to be not vulnerable to the OpenSSH vulnerabilities.
No other Cisco products are currently known to be affected by these vulnerabilities.
The buffer size or the number of channels in the fixed code is now correctly incremented only after a successful allocation where as initially they were being set before an allocation. Upon an allocation failure, which could be externally triggered, memory contents would be incorrectly erased by the cleanup process. This would result in a corruption of the memory which would eventually lead to a crash for the process using that memory.
Portable OpenSSH version (not OpenBSD version) 3.7p1 and 3.7.1p1 contain multiple vulnerabilities in the new PAM authentication code. These vulnerabilities are not known to affect any Cisco products.
Please note, the SSH server code under Cisco IOS has other vulnerabilities as documented by http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml which may be triggered by the code written to exploit the OpenSHH vulnerabilities.
An affected device, running an SSH server based on the OpenSSH implementation, may be vulnerable to a DoS attack when an exploit script is repeatedly executed against the same device.
Cisco is offering free software upgrades or patches to address these vulnerabilities for all affected customers. Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades or patches, Customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/public/sw-license-agreement.html, or as otherwise set forth at the Cisco Connection Online Software Center at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Customers with service contracts should contact their regular update channels to obtain the free software upgrade(s) or patches identified via this advisory. For most customers with service contracts, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com/tacpage/sw-center/. To access the software download URL, you must be a registered user and you must be logged in.
Customers whose Cisco products are provided or maintained through a prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with obtaining the free software upgrade(s).
Customers who purchased directly from Cisco but who do not hold a Cisco service contract, and customers who purchase through third party vendors but are unsuccessful at obtaining fixed software through their point of sale, should obtain fixed software by contacting the Cisco Technical Assistance Center (TAC) using the contact information listed below. In these cases, customers are entitled to obtain an upgrade to a later version of the same release or as indicated by the applicable corrected software version in the Software Versions and Fixes section (noted above).
See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.
Please have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.
The Cisco PSIRT recommends that affected users upgrade to a fixed software version of code as soon as it is available.
The Cisco PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory, at this time.
These vulnerabilities have also been documented by CERT/CC at
http://www.cert.org/advisories/CA-2003-24.html
.
This is an interim advisory. Although Cisco cannot guarantee the accuracy of all statements in this advisory, all of the facts have been checked to the best of our ability. Cisco does not anticipate issuing updated versions of this advisory unless there is some material change in the facts. Should there be a significant change in the facts, Cisco may update this advisory.
A stand-alone copy or paraphrase of the text of this security advisory that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
This advisory will be posted on Cisco's worldwide website at http://www.cisco.com/warp/public/707/cisco-sa-20030917-openssh.shtml.
In addition to worldwide website posting, a text version of this advisory is clear-signed with the Cisco PSIRT PGP key having the fingerprint 8C82 5207 0CA9 ED40 1DD2 EE2A 7B31 A8CF 32B6 B590 and is posted to the following e-mail and Usenet news recipients:
Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.
|
Revision 1.6 |
2003-November-07 |
Added Cisco PGW 2200 Softswitch as a vulnerable product. Added 8.1(3) as a fixed release for CatOS. |
|
Revision 1.5 |
2003-September-27 |
Added not vulnerable to Portable OpenSSH version in the details section. Added ACNS and BTS10200 as vulnerable. Added 5.x as affected release for CSS11000. Updated fix information for NAM. |
|
Revision 1.4 |
2003-September-23 |
Added CatOS release schedule in Software Versions and Fixes. |
|
Revision 1.3 |
2003-September-19 |
Added Cisco Content Service CSS11000 Switch series and Cisco Network Analysis Modules (NAM) as being affected. |
|
Revision 1.2 |
2003-September-18 |
Added an additional workaround for the CatOS in the Workaround section. |
|
Revision 1.1 |
2003-September-18 |
Added CatOS versions, Cisco Secure Intrusion Detection System (NetRanger) appliance, and Cisco GSS 4480 Global Site Selector to the Affected Products section; and Cisco Secure Intrusion Detection System Catalyst Module (IDSM) to the not vulnerable list. Added Cisco Secure Intrusion Detection System (NetRanger) appliance, and Cisco GSS 4480 Global Site Selector to the Details section, and added Bug IDs for the products. Added Cisco Secure Intrusion Detection System (NetRanger) appliance to the Software Versions and Fixes section, and added upcoming fixes for the products. |
|
Revision 1.0 |
2003-September-17 |
Initial public release. |
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.
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| Updated: Jan 30, 2006 | Document ID: 45322 |