Atheros Vendor Specific Information Element Overflow

2008.09.05
Credit: Laurent Butti
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 6.3/10
Impact Subscore: 6.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: None
Availability impact: Complete

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

References:

http://www.securityfocus.com/bid/31012
http://www.securityfocus.com/archive/1/archive/1/495984/100/0/threaded


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