Jul.29, 2009: 2 new Cisco critical vulnerabilities

An article by Fabio Semperboni    No Comments

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On July 29, 2009, the The Cisco Product Security Incident Response Team (PSIRT) has published 2 new vulnerability advisories.

1) Active Template Library (ATL) Vulnerability
Certain Cisco products that use Microsoft Active Template Libraries (ATL) and headers may be vulnerable to remote code execution. In some instances, the vulnerability may be exploited against Microsoft Internet Explorer to perform kill bit bypass. In order to exploit this vulnerability, an attacker must convince a user to visit a malicious web site.

Vulnerable Products
The following products are affected by this vulnerability:Cisco Unity 4.x, 5x., and 7.x

Details
Microsoft has identified vulnerabilities in the Active Template Library (ATL) headers that are shipped with the Software Development Kit (SDK) for Microsoft Windows systems and used in Cisco products. In general, this vulnerability, if exposed by an ActiveX control, could lead to remote code execution on a client’s system.

Impact
Successful exploitation of the vulnerability may result in remote code execution.

Link: http://www.cisco.com/…/advisory09186a0080ae9e43.shtml

2) Cisco IOS Software Border Gateway Protocol 4-Byte Autonomous System Number Vulnerabilities
Recent versions of Cisco IOS Software support RFC4893 (“BGP Support for Four-octet AS Number Space”) and contain two remote denial of service (DoS) vulnerabilities when handling specific Border Gateway Protocol (BGP) updates. These vulnerabilities affect only devices running Cisco IOS Software with support for four-octet AS number space (here after referred to as 4-byte AS number) and BGP routing configured.

• The first vulnerability could cause an affected device to reload when processing a BGP update that contains autonomous system (AS) path segments made up of more than one thousand autonomous systems.

• The second vulnerability could cause an affected device to reload when the affected device processes a malformed BGP update that has been crafted to trigger the issue.

Vulnerable Products
These vulnerabilities affect only devices running Cisco IOS and Cisco IOS XE Software (here after both referred to as simply Cisco IOS) with support for RFC4893 and that have been configured for BGP routing.

Details

• The first vulnerability could cause an affected device to reload when processing a BGP update that contains AS path segments made up of more than one thousand autonomous systems. If an affected 4-byte AS number BGP speaker receives a BGP update from a 2-byte AS number BGP speaker that contains AS path segments made up of more than one thousand autonomous systems, the device may crash with memory corruption, and the error “%%Software-forced reload” will be displayed.

• The second vulnerability could cause an affected device to reload when the affected device processes a malformed BGP update that has been crafted to trigger the issue.

Impact
Successful exploitation of the vulnerabilities described in this document may result in a reload of the device. The issue could result in repeated exploitation to cause an extended DoS condition.

Link: http://www.cisco.com/…/dvisory09186a0080aea4c9.shtml