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[ GLSA 201408-06 ] libpng: Multiple vulnerabilities
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PostPosted: Thu Aug 14, 2014 3:26 pm    Post subject: [ GLSA 201408-06 ] libpng: Multiple vulnerabilities Reply with quote

Gentoo Linux Security Advisory

Title: libpng: Multiple vulnerabilities (GLSA 201408-06)
Severity: normal
Exploitable: remote
Date: August 14, 2014
Bug(s): #503014, #507378
ID: 201408-06


Multiple vulnerabilities have been discovered in libpng which can
allow a remote attacker to cause a Denial of Service condition.


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.

Affected Packages

Package: media-libs/libpng
Vulnerable: < 1.6.10
Unaffected: >= 1.6.10
Unaffected: < 1.3
Unaffected: >= 1.5.18 < 1.5.19
Architectures: All supported architectures


The png_push_read_chunk function in pngpread.c in the progressive
decoder enters an infinite loop, when it encounters a zero-length IDAT
chunk. In addition certain integer overflows have been detected and
The 1.2 branch is not affected by these vulnerabilities.


A remote attacker could entice a user to open a specially crafted PNG
file using an application linked against libpng, possibly resulting in
Denial of Service.


There is no known workaround at this time.


All libpng users should upgrade to the latest version:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.10"
Users with current installs in the 1.5 branch should also upgrade this
# emerge --sync
        # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.18:1.5"
Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying these packages.




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