libextractor: Multiple overflow vulnerabilities

Background

libextractor is a library used to extract meta-data from files. It makes use of Xpdf code to extract information from PDF files.

Description

Xpdf is vulnerable to multiple overflows, as described in GLSA 200501-28. Also, integer overflows were discovered in Real and PNG extractors.

Impact

An attacker could design malicious PDF, PNG or Real files which, when processed by an application making use of libextractor, would result in the execution of arbitrary code with the rights of the user running the application.

Workaround

There is no known workaround at this time.

Resolution

All libextractor users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=media-libs/libextractor-0.5.0"