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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200603-15] Crypt::CBC: Insecure initialization vector

Vulnerability Assessment Details

[GLSA-200603-15] Crypt::CBC: Insecure initialization vector

Vulnerability Assessment Summary
Crypt::CBC: Insecure initialization vector

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200603-15
(Crypt::CBC: Insecure initialization vector)

Lincoln Stein discovered that Crypt::CBC fails to handle 16 bytes
long initializiation vectors correctly when running in the RandomIV
mode, resulting in a weaker encryption because the second part of every
block will always be encrypted with zeros if the blocksize of the
cipher is greater than 8 bytes.

Impact

A possible hacker could exploit weak ciphertext produced by Crypt::CBC
to bypass certain security restrictions or to gain access to sensitive
data.

Workaround

There is no known workaround at this time.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0898

Solution:
All Crypt::CBC users should upgrade to the latest available
version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17"

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

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