GnuTLS fails to handle excess data which could allow an attacker to forge a PKCS #1 v1.5 signature.
|Package||net-libs/gnutls on all architectures|
|Affected versions||< 1.4.4|
|Unaffected versions||>= 1.4.4|
GnuTLS is an implementation of SSL 3.0 and TLS 1.0.
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.
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.
There is no known workaround at this time.
All GnuTLS users should update both packages:
# emerge --sync # emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4"
September 26, 2006
September 26, 2006: 01