ZDI-12-156 : Cisco AnyConnect VPN Client Arbitrary Program Instantiation Remote Code Execution Vulnerability

2012-08-26T00:00:00
ID SECURITYVULNS:DOC:28404
Type securityvulns
Reporter Securityvulns
Modified 2012-08-26T00:00:00

Description

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

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

-----BEGIN PGP SIGNATURE----- Version: PGP Desktop 10.2.0 (Build 1950) Charset: utf-8

wsBVAwUBUDUGKFVtgMGTo1scAQJBPAf9H07i4XSMxk4rQiyN2q+nbl3EtBX0Rl1e xAplYDC/F+HWp0ZZGEQC+PDyvkkgMqlOpYVNcgZr7jHfxH82Aon4cWY02qb5C5mZ HJZbQkd0tvIUANGrOC860lPgHXkQQEroOdwSXAC+AM/11UN+3wDPdM/FSXEnzndT mQxcSgj7e5TzubW6A9NI0iHj8v+Ci38hPxC2r0JbmR3VKcbcBHqfV9By5PYDogGx Hgq87lolCGF/+DG6JP9e6zeYtPPntpq0SPHNZ77Ew5Vr/9cARf0iZn41auS20pgW j0hZC4YsC5nsQwYkns7jYO3nf6e9Jq69k3BjdudkbVe7zgb3/986Jg== =pj7G -----END PGP SIGNATURE-----