Python: Multiple integer overflows

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Updated July 01, 2008

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200807-01 / python
Release Date	July 01, 2008
Latest Revision	July 01, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-lang/python	< 2.4.4-r13	revision >= 2.3.6-r6, >= 2.4.4-r13	All supported architectures

Related bugreports: #216673, #217221

Synopsis

Multiple integer overflows may allow for Denial of Service.

2. Impact Information

Background

Python is an interpreted, interactive, object-oriented programming language.

Description

Multiple vulnerabilities were discovered in Python:

David Remahl reported multiple integer overflows in the file imageop.c, leading to a heap-based buffer overflow (CVE-2008-1679). This issue is due to an incomplete fix for CVE-2007-4965.
Justin Ferguson discovered that an integer signedness error in the zlib extension module might trigger insufficient memory allocation and a buffer overflow via a negative signed integer (CVE-2008-1721).
Justin Ferguson discovered that insufficient input validation in the PyString_FromStringAndSize() function might lead to a buffer overflow (CVE-2008-1887).

Impact

A remote attacker could exploit these vulnerabilities to cause a Denial of Service or possibly the remote execution of arbitrary code with the privileges of the user running Python.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

The imageop module is no longer built in the unaffected versions.

All Python 2.3 users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/python-2.3.6-r6"

All Python 2.4 users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/python-2.4.4-r13"

4. References