Security
Security
A null pointer dereference in libpng might allow remote attackers to execute arbitrary code.
| Package | media-libs/libpng on all architectures |
|---|---|
| Affected versions | < 1.6.27 |
| Unaffected versions | >= 1.6.27 >= 1.5.28 >= 1.2.57 |
libpng is a standard library used to process PNG (Portable Network Graphics) images. It is used by several programs, including web browsers and potentially server processes.
A null pointer dereference was discovered in libpng in the png_push_save_buffer function. In order to be vulnerable, an application has to load a text chunk into the PNG structure, then delete all text, then add another text chunk to the same PNG structure, which seems to be an unlikely sequence, but it is possible.
A remote attacker, by enticing a user to process a specially crafted PNG file, could execute arbitrary code with the privileges of the process.
There is no known workaround at this time.
All libpng 1.6.x users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.27"
All libpng 1.5.x users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.28:1.5"
All libpng 1.2.x users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.57:1.2"
Release date
January 29, 2017
Latest revision
January 29, 2017: 1
Severity
normal
Exploitable
remote
Bugzilla entries