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Zero Day Initiative Advisory 12-149

Zero Day Initiative Advisory 12-149
Posted Aug 23, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-149 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Cisco AnyConnect VPN Client. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists because the VPN AnyConnect helper program does not check the version number of the vpndownloader.exe program it downloads. As such it is possible to forcefully install an older version of the vpndownloader.exe that is vulnerable to previously patched issues.

tags | advisory, remote, arbitrary
systems | cisco
advisories | CVE-2012-2494
SHA-256 | 75dc16487817f808542467ad8adc6967577a1b02ed4a8410431a230537dc12d4

Zero Day Initiative Advisory 12-149

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ZDI-12-149 : Cisco AnyConnect VPN Client Verification Bypass Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-149
August 22, 2012

- -- CVE ID:
CVE-2012-2494

- -- CVSS:
9, AV:N/AC:L/Au:N/C:P/I:P/A:C

- -- Affected Vendors:
Cisco

- -- Affected Products:
Cisco AnyConnect VPN Client

- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Cisco AnyConnect VPN Client. User interaction
is required to exploit this vulnerability in that the target must visit a
malicious page or open a malicious file.

The specific flaw exists because the VPN AnyConnect helper program does not
check the version number of the vpndownloader.exe program it downloads. As
such it is possible to forcefully install an older version of the
vpndownloader.exe that is vulnerable to previously patched issues.

- -- Vendor Response:
Cisco has issued an update to correct this vulnerability. More details can
be found at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-
sa-20120620-ac

- -- Disclosure Timeline:
2011-11-22 - Vulnerability reported to vendor
2012-08-22 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* gwslabs.com

- -- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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