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vulnerability bulletin CVE-2014-0333

libpng: infinite loop of IDAT

Synthesis of the vulnerability

An attacker can create a malicious PNG image, to generate an infinite loop during the analysis of IDAT by libpng, in order to trigger a denial of service.
Impacted products: Fedora, openSUSE, Unix (platform).
Severity: 1/4.
Creation date: 26/02/2014.
Identifiers: BID-65776, CVE-2014-0333, FEDORA-2014-4564, FEDORA-2014-6631, openSUSE-SU-2014:0358-1, VIGILANCE-VUL-14313, VU#684412.

Description of the vulnerability

The libpng library is used by several applications to decode or display PNG images.

The IDAT field of a PNG image contains image data. However, if this field is empty, the png_push_read_chunk() function of the pngpread.c file tries to indefinitely read data.

An attacker can therefore create a malicious PNG image, to generate an infinite loop during the analysis of IDAT by libpng, in order to trigger a denial of service.
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