Red Hat Bugzilla – Bug 1069301
CVE-2009-5138 gnutls: incorrect handling of V1 intermediate certificates
Last modified: 2015-02-04 07:48:53 EST
While investigating GnuTLS issue CVE-2014-1959 (bug 1065092), it was discovered that older versions of GnuTLS were affected by the same problem, with a different root cause. When using default certificate verification settings, GnuTLS accepted version 1 X.509 certificates as intermediate CAs. An attacker able to obtain a V1 certificate from a CA trusted by application could generate certificates for other hosts or users that would be accepted by GnuTLS.
This issue affected GnuTLS versions before 2.7.6. Problem was reported in the following post:
and fixed upstream via:
This did not affect applications that used GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT verification flag, which instructs GnuTLS to allow root CA certificates to be version 1 certificates. This was set by e.g. gnutls-cli client application in GnuTLS versions affected by this bug.
This issue affects gnutls packages in Red Hat Enterprise Linux 5. Versions used in Red Hat Enterprise Linux 6 or current Fedora versions are newer than 2.7.6 and are not affected.
It seems this issue was introduced in upstream version 1.2.1 via:
CVE-2009-5138 was assigned to this issue:
Created mingw32-gnutls tracking bugs for this issue:
Affects: epel-5 [bug 1071851]
This issue did not affect the versions of gnutls as shipped with Red Hat Enterprise Linux 6.
This issue has been addressed in following products:
Red Hat Enterprise Linux 5
Via RHSA-2014:0247 https://rhn.redhat.com/errata/RHSA-2014-0247.html