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Last updated: 5/3/2016 2:59:45 AM

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Vulnerability Summary for CVE-2006-4790

Original release date: 09/14/2006
Last revised: 03/07/2011


verify.c in GnuTLS before 1.4.4, when using an RSA key with exponent 3, does not properly handle excess data in the digestAlgorithm.parameters field when generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents GnuTLS from correctly verifying X.509 and other certificates that use PKCS, a variant of CVE-2006-4339.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.0 MEDIUM
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification

Vendor Statements (disclaimer)

Official Statement from Red Hat (03/14/2007)
Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.

References to Advisories, Solutions, and Tools

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External Source: GENTOO
Name: GLSA-200609-15
External Source: VUPEN
Name: ADV-2006-3899
External Source: REDHAT
Name: RHSA-2006:0680
Type: Advisory; Patch Information
External Source: MANDRIVA
Name: MDKSA-2006:166
External Source: MLIST
Name: [gnutls-dev] 20060908 Variant of Bleichenbacher's crypto 06 rump session attack
External Source: MLIST
Name: [gnutls-dev] 20060912 Re: Variant of Bleichenbacher's crypto 06 rump session attack
External Source: CONFIRM
Name: http://support.avaya.com/elmodocs2/security/ASA-2006-250.htm
External Source: VUPEN
Name: ADV-2007-2289
External Source: OVAL
Name: oval:org.mitre.oval:def:9937
External Source: SUNALERT
Name: 102970
External Source: CONFIRM
Name: http://www.gnu.org/software/gnutls/security.html
Type: Patch Information
External Source: DEBIAN
Name: DSA-1182
External Source: SUSE
Name: SUSE-SA:2007:010
External Source: VUPEN
Name: ADV-2006-3635
External Source: BID
Name: 20027
External Source: SUSE
Name: SUSE-SR:2006:023
External Source: SUNALERT
Name: 102648
External Source: SECTRACK
Name: 1016844
External Source: XF
Name: gnutls-rsakey-security-bypass(28953)
External Source: UBUNTU
Name: USN-348-1

References to Check Content

Identifier: oval:org.mitre.oval:def:9937
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

Vulnerability Type (View All)