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Gentoo Linux Security Advisory GLSA 200405-06 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: libpng denial of service vulnerability |
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Date: May 14, 2004 |
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Bugs: #49887 |
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ID: 200405-06 |
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Synopsis |
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======== |
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|
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A bug in the libpng library can be abused to crash programs making use |
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of that library to decode PNG images. |
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Background |
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========== |
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|
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libpng is a standard library used to process PNG (Portable Network |
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Graphics) 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 <= 1.2.5-r4 >= 1.2.5-r5 |
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|
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Description |
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=========== |
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|
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libpng provides two functions (png_chunk_error and png_chunk_warning) |
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for default error and warning messages handling. These functions do not |
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perform proper bounds checking on the provided message, which is |
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limited to 64 bytes. Programs linked against this library may crash |
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when handling a malicious PNG image. |
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|
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Impact |
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====== |
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|
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This vulnerability could be used to crash various programs using the |
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libpng library, potentially resulting in a denial of service attack on |
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vulnerable daemon processes. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. All users are advised to |
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upgrade to the latest available version of libpng. |
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Resolution |
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========== |
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All users of libpng should upgrade to the latest stable version: |
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# emerge sync |
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# emerge -pv ">=media-libs/libpng-1.2.5-r5" |
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# emerge ">=media-libs/libpng-1.2.5-r5" |
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|
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You should also run revdep-rebuild to rebuild any packages that depend |
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on older versions of libpng : |
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|
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# revdep-rebuild |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2004-0421 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0421 |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200405-06.xml |
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|
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Concerns? |
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========= |
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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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|
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Copyright 2004 Gentoo Technologies, Inc; referenced text |
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belongs to its owner(s). |
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|
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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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http://creativecommons.org/licenses/by-sa/1.0 |
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