libexif: Integer overflow vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200706-01 / libexif
Release Date	June 05, 2007
Latest Revision	June 05, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/libexif	< 0.6.15	>= 0.6.15	All supported architectures

Related bugreports: #178081

Synopsis

libexif fails to handle Exif (EXchangeable Image File) data inputs, making it vulnerable to an integer overflow.

2. Impact Information

Background

libexif is a library for parsing, editing and saving Exif data.

Description

Victor Stinner reported an integer overflow in the exif_data_load_data_entry() function from file exif-data.c while handling Exif data.

Impact

An attacker could entice a user to process a file with specially crafted Exif extensions with an application making use of libexif, which will trigger the integer overflow and potentially execute arbitrary code or crash the application.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All libexif users should upgrade to the latest version. Please note that users upgrading from "<=media-libs/libexif-0.6.13" should also run revdep-rebuild after their upgrade.

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/libexif-0.6.15"
# revdep-rebuild --library=/usr/lib/libexif.so

4. References

CVE-2007-2645

Page updated June 05, 2007

Summary: This is a Gentoo Linux Security Advisory

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