National Vulnerability Database (NVD) National Vulnerability Database (CVE-2007-3731)

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Last updated: Tue Aug 25 11:00:07 EDT 2009

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Vulnerability Summary for CVE-2007-3731

Original release date:09/17/2007

Last revised:11/15/2008

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 serviceUnknown

Vendor Statments (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: CONFIRM

Name: https://bugzilla.redhat.com/show_bug.cgi?id=248324

Type: Patch Information

Hyperlink:https://bugzilla.redhat.com/show_bug.cgi?id=248324

External Source: UBUNTU

Name: USN-518-1

Hyperlink:http://www.ubuntu.com/usn/usn-518-1

External Source: BID

Name: 25801

Hyperlink:http://www.securityfocus.com/bid/25801

External Source: REDHAT

Name: RHSA-2007:0940