libpng denial-of-service vulnerability

Overview

libpng versions 1.6.0 through 1.6.9 contain a denial-of-service vulnerability.

Description

CWE-835: Loop with Unreachable Exit Condition (‘Infinite Loop’) - CVE-2014-0333

Glenn Randers Pehrson of the PNG Development Group reports:

The progressive decoder in libpng16 enters an infinite loop, thus hanging the application, when it encounters a zero-length IDAT chunk. Only libpng-1.6.0 and later are affected, and only applications using the progressive reader…The loop consumes CPU time but no memory or other resources.

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Impact

Decoding a malformed .png file may cause the target application to become unresponsive.

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Solution

Apply an Update
The PNG Development Group has released a patch to address this issue for libpng versions 1.6.0 through 1.6.9. The patch can be found at both simplesystems.org and the libpng Sourceforge project.

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Vendor Information

684412

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libpng Affected

Updated: February 25, 2014

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P
Temporal	3.6	E:F/RL:OF/RC:C
Environmental	3.6	CDP:N/TD:H/CR:ND/IR:ND/AR:ND

References

• <https://sourceforge.net/projects/libpng/files/libpng16/patch-libpng16-vu684412.diff&gt;
• <ftp://ftp.simplesystems.org/pub/png/src/libpng16/patch-libpng16-vu684412.diff&gt;

Acknowledgements

Thanks to Glenn Randers-Pehrson for reporting this vulnerability.

This document was written by Todd Lewellen.

Other Information

CVE IDs:	CVE-2014-0333
Date Public:	2014-02-25 Date First Published: