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Gentoo Linux Security Advisory GLSA 200903-28 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: libpng: Multiple vulnerabilities |
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Date: March 15, 2009 |
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Bugs: #244808, #255231, #259578 |
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ID: 200903-28 |
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Synopsis |
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======== |
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|
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Multiple vulnerabilities were found in libpng, which might result in |
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the execution of arbitrary code |
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|
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Background |
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========== |
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|
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libpng is the official PNG reference library used to read, write and |
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manipulate PNG images. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 media-libs/libpng < 1.2.35 >= 1.2.35 |
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|
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Description |
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=========== |
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|
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Multiple vulnerabilities were discovered in libpng: |
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|
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* A memory leak bug was reported in png_handle_tEXt(), a function |
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that is used while reading PNG images (CVE-2008-6218). |
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|
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* A memory overwrite bug was reported by Jon Foster in |
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png_check_keyword(), caused by writing overlong keywords to a PNG |
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file (CVE-2008-5907). |
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|
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* A memory corruption issue, caused by an incorrect handling of an |
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out of memory condition has been reported by Tavis Ormandy of the |
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Google Security Team. That vulnerability affects direct uses of |
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png_read_png(), pCAL chunk and 16-bit gamma table handling |
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(CVE-2009-0040). |
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|
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Impact |
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====== |
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|
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A remote attacker may execute arbitrary code with the privileges of the |
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user opening a specially crafted PNG file by exploiting the erroneous |
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out-of-memory handling. An attacker may also exploit the |
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png_check_keyword() error to set arbitrary memory locations to 0, if |
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the application allows overlong, user-controlled keywords when writing |
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PNG files. The png_handle_tEXT() vulnerability may be exploited by an |
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attacker to potentially consume all memory on a users system when a |
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specially crafted PNG file is opened. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All libpng users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.35" |
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References |
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========== |
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[ 1 ] CVE-2008-5907 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5907 |
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[ 2 ] CVE-2008-6218 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-6218 |
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[ 3 ] CVE-2009-0040 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0040 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200903-28.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2009 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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