Software Engineering Institute

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.

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

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.