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securityvulnsSecurityvulnsSECURITYVULNS:DOC:20474
HistorySep 07, 2008 - 12:00 a.m.

Atheros Vendor Specific Information Element Overflow

2008-09-0700:00:00
vulners.com
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Title:

  • Atheros Vendor Specific Information Element Overflow

Summary:

  • The wireless drivers in some Wi-Fi access points (such as the
    ATHEROS-based Linksys WRT350N) do not correctly parse the Atheros vendor
    specific information element included in association requests. This
    information element is used by wireless devices to advertise Atheros
    specific capabilities.

Assigned CVE:

  • CVE-2007-5474

Details:

  • The bug can be triggered by a malicious association request sent to
    the wireless access point where one of the information elements must be
    an Atheros information element with an inappropriate length (typically
    too long). This can be achieved only after a successful 802.11
    authentication (in "Open" or "Shared" mode according to the
    configuration of the wireless access point).

Attack Impact:

  • Denial-of-service (reboot or hang-up) and possibly remote arbitrary
    code execution

Attack Vector:

  • Unauthenticated wireless device

Timeline:

  • 2007-10-22 - Vulnerability reported to Linksys
  • 2007-10-23 - Full details sent to Linksys
  • 2008-09-04 - Public disclosure

Affected Products:

  • Linksys WRT350N (firmware v2.00.17) with Atheros AR5416-AC1E chipset

Vulnerable Devices:

  • As it is a wireless driver specific issue, the wireless vendor should
    use the latest chipset wireless driver for their access point firmwares.
    This security vulnerability was reported to Linksys, updated firmwares
    should be available on their web site. Any other wireless device relying
    on this vulnerable wireless driver is likely to be vulnerable.

Credits:

  • This vulnerability was discovered by Laurent Butti and Julien Tinnes
    from France Telecom / Orange
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