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Last updated: 4/23/2014

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National Cyber Awareness System

Vulnerability Summary for CVE-2007-3731

Original release date: 09/17/2007
Last revised: 08/21/2010
Source: US-CERT/NIST

Overview

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.9 (MEDIUM) (AV:L/AC:L/AU:N/C:N/I:N/A:C) (legend)
Impact Subscore: 6.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (10/18/2007)
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, or 4.

References to Advisories, Solutions, and Tools

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External Source: MISC
Name: http://bugzilla.kernel.org/show_bug.cgi?id=8765
External Source: SECUNIA
Name: 26955
External Source: SECUNIA
Name: 27322
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=248324
Type: Patch Information
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=29eb51101c02df517ca64ec472d7501127ad1da8
External Source: SECUNIA
Name: 29159
External Source: OSVDB
Name: 37286
External Source: BUGTRAQ
Name: 20080229 rPSA-2008-0094-1 kernel
External Source: CONFIRM
Name: http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0094
External Source: UBUNTU
Name: USN-518-1
External Source: SECUNIA
Name: 26978
External Source: BID
Name: 25801
External Source: SECUNIA
Name: 26935
External Source: REDHAT
Name: RHSA-2007:0940
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a10d9a71bafd3a283da240d2868e71346d2aef6f
External Source: DEBIAN
Name: DSA-1378
External Source: CONFIRM
Name: https://issues.rpath.com/browse/RPL-2304
External Source: OVAL
Name: oval:org.mitre.oval:def:10394

References to Check Content

Identifier: oval:org.mitre.oval:def:10394
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

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