Cpio: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200711-18 / cpio
Release Date	November 14, 2007
Latest Revision	November 14, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-arch/cpio	< 2.9-r1	>= 2.9-r1	All supported architectures

Related bugreports: #196978

Synopsis

GNU cpio contains a buffer overflow vulnerability, possibly resulting in a Denial of Service.

2. Impact Information

Background

GNU cpio copies files into or out of a cpio or tar archive.

Description

A buffer overflow vulnerability in the safer_name_suffix() function in GNU cpio has been discovered.

Impact

A remote attacker could entice a user to open a specially crafted archive file resulting in a stack-based buffer overflow, possibly crashing the application. It is disputed whether the execution of arbitrary code is possible.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All GNU cpio users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/cpio-2.9-r1"

4. References

CVE-2007-4476

Page updated November 14, 2007

Summary: This is a Gentoo Linux Security Advisory

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