Bug 1069301 (CVE-2009-5138) - CVE-2009-5138 gnutls: incorrect handling of V1 intermediate certificates
Summary: CVE-2009-5138 gnutls: incorrect handling of V1 intermediate certificates
Alias: CVE-2009-5138
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1069888 1069889 1071851
Blocks: 1065093
TreeView+ depends on / blocked
Reported: 2014-02-24 17:13 UTC by Tomas Hoger
Modified: 2021-02-17 06:49 UTC (History)
12 users (show)

Fixed In Version: gnutls 2.7.6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-03-03 19:06:03 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0247 0 normal SHIPPED_LIVE Important: gnutls security update 2014-03-03 23:25:17 UTC

Description Tomas Hoger 2014-02-24 17:13:28 UTC
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.

Comment 1 Tomas Hoger 2014-02-25 20:50:09 UTC
It seems this issue was introduced in upstream version 1.2.1 via:


Comment 4 Tomas Hoger 2014-02-27 07:45:42 UTC
CVE-2009-5138 was assigned to this issue:


Comment 5 Tomas Hoger 2014-03-03 10:17:14 UTC
Created mingw32-gnutls tracking bugs for this issue:

Affects: epel-5 [bug 1071851]

Comment 6 Tomas Hoger 2014-03-03 10:20:42 UTC

This issue did not affect the versions of gnutls as shipped with Red Hat Enterprise Linux 6.

Comment 7 errata-xmlrpc 2014-03-03 18:25:55 UTC
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

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