gnutls-cli in GnuTLS before 2.6.6 does not verify the activation and expiration times of X.509 certificates, which allows remote attackers to successfully present a certificate that is (1) not yet valid or (2) no longer valid, related to lack of time checks in the _gnutls_x509_verify_certificate function in lib/x509/verify.c in libgnutls_x509, as used by (a) Exim, (b) OpenLDAP, and (c) libsoup.
CVSS Severity (version 2.0):
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
Official Statement from Red Hat (08/11/2009)
The Red Hat Security Response Team has rated this issue as having low security impact. The risks associated with fixing this bug are greater than the low severity security risk. We therefore currently have no plans to fix this flaw in Red Hat Enterprise Linux 4, or 5.
For further details, see: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-1417
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[gnutls-devel] 20090430 Certificate expiration not checked by gnutls-cli [GNUTLS-SA-2009-3] [CVE-2009-1417]