Summaryinfo

A vulnerability, which was classified as problematic, has been found in Cisco ASA up to 8.4.6. This impacts an unknown function of the component SSL VPN Rewriter-Modul. Performing a manipulation results in race condition. This vulnerability is reported as CVE-2013-1199. Moreover, an exploit is present. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco ASA up to 8.4.6 (Firewall Software). It has been classified as problematic. This affects an unknown functionality of the component SSL VPN Rewriter-Modul. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on availability. The summary by CVE is:

Race condition in the CIFS implementation in the rewriter module in the Clientless SSL VPN component on Cisco Adaptive Security Appliances (ASA) devices allows remote authenticated users to cause a denial of service (device reload) by accessing resources within multiple sessions, aka Bug ID CSCub58996.

The weakness was disclosed 04/17/2013 as 29015 as confirmed bulletin (Website). The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2013-1199 since 01/11/2013. The exploitability is told to be difficult. It is possible to initiate the attack remotely. The successful exploitation needs a authentication. Technical details are unknown but a public exploit is available.

After immediately, there has been an exploit disclosed. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at tools.cisco.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at OSVDB (92546†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA

Version

• 8.4.0
• 8.4.1
• 8.4.2
• 8.4.3
• 8.4.4
• 8.4.5
• 8.4.6

License

• commercial

Website

• Vendor: https://www.cisco.com/

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