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Zero Day Initiative Advisory 12-156

Zero Day Initiative Advisory 12-156
Posted Aug 23, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-156 - 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 due to insufficient signature checks with the Cisco AnyConnect VPN Client. When the client is invoked through the ActiveX control it downloads and checks a file called vpndownloader.exe. This file has to be properly signed by Cisco. Once this file is downloaded it is run and downloads additional configuration files. Within the downloaded config file it is possible to force a download of executable files. Those files are not properly checked for valid certificates and are run on the host as soon as they are downloaded.

tags | advisory, remote, arbitrary, activex
systems | cisco
advisories | CVE-2012-2493
MD5 | 7600cb6a10067078a37e9f299555a890

Zero Day Initiative Advisory 12-156

Change Mirror Download
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ZDI-12-156 : Cisco AnyConnect VPN Client Arbitrary Program Instantiation
Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-156
August 22, 2012

- -- CVE ID:
CVE-2012-2493

- -- 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 due to insufficient signature checks with the
Cisco AnyConnect VPN Client. When the client is invoked through the ActiveX
control it downloads and checks a file called vpndownloader.exe. This file
has to be properly signed by Cisco. Once this file is downloaded it is run
and downloads additional configuration files. Within the downloaded config
file it is possible to force a download of executable files. Those files
are not properly checked for valid certificates and are run on the host as
soon as they are downloaded.

- -- 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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