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Gentoo Linux Security Advisory GLSA 200603-15 |
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http://security.gentoo.org/ |
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Severity: Low |
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Title: Crypt::CBC: Insecure initialization vector |
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Date: March 17, 2006 |
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Bugs: #126048 |
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ID: 200603-15 |
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Synopsis |
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======== |
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|
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Crypt::CBC uses an insecure initialization vector, potentially |
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resulting in a weaker encryption. |
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|
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Background |
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========== |
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|
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Crypt::CBC is a Perl module to encrypt data using cipher block chaining |
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(CBC). |
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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/crypt-cbc < 2.17 >= 2.17 |
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|
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Description |
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=========== |
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|
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Lincoln Stein discovered that Crypt::CBC fails to handle 16 bytes long |
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initializiation vectors correctly when running in the RandomIV mode, |
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resulting in a weaker encryption because the second part of every block |
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will always be encrypted with zeros if the blocksize of the cipher is |
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greater than 8 bytes. |
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|
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Impact |
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====== |
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|
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An attacker could exploit weak ciphertext produced by Crypt::CBC to |
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bypass certain security restrictions or to gain access to sensitive |
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data. |
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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 Crypt::CBC users should upgrade to the latest available version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2006-0898 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0898 |
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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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|
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http://security.gentoo.org/glsa/glsa-200603-15.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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License |
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======= |
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|
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Copyright 2006 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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http://creativecommons.org/licenses/by-sa/2.0 |
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