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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200609-15] GnuTLS: RSA Signature Forgery

Vulnerability Assessment Details

[GLSA-200609-15] GnuTLS: RSA Signature Forgery

Vulnerability Assessment Summary
GnuTLS: RSA Signature Forgery

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200609-15
(GnuTLS: RSA Signature Forgery)

verify.c fails to properly handle excess data in
digestAlgorithm.parameters field while generating a hash when using an
RSA key with exponent 3. RSA keys that use exponent 3 are commonplace.

Impact

Remote attackers could forge PKCS #1 v1.5 signatures that are signed
with an RSA key, preventing GnuTLS from correctly verifying X.509 and
other certificates that use PKCS.

Workaround

There is no known workaround at this time.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790

Solution:
All GnuTLS users should update both packages:
# emerge --sync
# emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

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