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Gentoo Linux Security Advisory GLSA 200410-31 |
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http://security.gentoo.org/ |
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Severity: Low |
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Title: Archive::Zip: Virus detection evasion |
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Date: October 29, 2004 |
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Bugs: #68616 |
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ID: 200410-31 |
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Synopsis |
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======== |
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|
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Email virus scanning software relying on Archive::Zip can be fooled |
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into thinking a ZIP attachment is empty while it contains a virus, |
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allowing detection evasion. |
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|
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Background |
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========== |
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|
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Archive::Zip is a Perl module containing functions to handle ZIP |
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archives. |
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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 dev-perl/Archive-Zip < 1.14 >= 1.14 |
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|
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Description |
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=========== |
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|
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Archive::Zip can be used by email scanning software (like amavisd-new) |
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to uncompress attachments before virus scanning. By modifying the |
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uncompressed size of archived files in the global header of the ZIP |
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file, it is possible to fool Archive::Zip into thinking some files |
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inside the archive have zero length. |
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|
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Impact |
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====== |
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|
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An attacker could send a carefully crafted ZIP archive containing a |
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virus file and evade detection on some email virus-scanning software |
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relying on Archive::Zip for decompression. |
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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 Archive::Zip users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=dev-perl/Archive-Zip-1.14" |
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|
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References |
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========== |
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[ 1 ] iDEFENSE Security Advisory 10.18.04 |
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http://www.idefense.com/application/poi/display?id=153 |
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[ 2 ] rt.cpan.org bug #8077 |
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http://rt.cpan.org/NoAuth/Bug.html?id=8077 |
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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-200410-31.xml |
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|
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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 2004 Gentoo Foundation, 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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|
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http://creativecommons.org/licenses/by-sa/1.0 |
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