National Cyber-Alert System
Vulnerability Summary for CVE-2009-2844
Original release date:08/18/2009
Last revised:09/02/2009
Source:
US-CERT/NIST
Overview
cfg80211 in net/wireless/scan.c in the Linux kernel 2.6.30-rc1 and other versions before 2.6.31-rc6 allows remote attackers to cause a denial of service (crash) via a sequence of beacon frames in which one frame omits an SSID Information Element (IE) and the subsequent frame contains an SSID IE, which triggers a NULL pointer dereference in the cmp_ies function. NOTE: a potential weakness in the is_mesh function was also addressed, but the relevant condition did not exist in the code, so it is not a vulnerability.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
Official Statement from Red Hat (08/19/2009)
Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, 5 or Red Hat Enterprise MRG.
Please note this issue only affected Linux kernel versions after v2.6.30-rc1 and was fixed in v2.6.31-rc6.
References to Advisories, Solutions, and Tools
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External Source: MLIST
Name: [oss-security] 20090817 Re: CVE request: kernel: cfg80211: missing NULL pointer checks
Type: Patch Information
External Source: MLIST
Name: [oss-security] 20090817 CVE request: kernel: cfg80211: missing NULL pointer checks
Type: Patch Information
External Source: MISC
Name: http://jon.oberheide.org/files/cfg80211-remote-dos.c
Type: Patch Information
External Source: BID
Name: 36052
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.5
External Source: SECUNIA
Name: 36278
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=cd3468bad96c00b5a512f551674f36776129520e
