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

[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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