Permissions, Privileges, and Access Controls in GnuTLS

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU41959

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2009-5138

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

GnuTLS before 2.7.6, when the GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT flag is not enabled, treats version 1 X.509 certificates as intermediate CAs, which allows remote attackers to bypass intended restrictions by leveraging a X.509 V1 certificate from a trusted CA to issue new certificates, a different vulnerability than CVE-2014-1959.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GnuTLS: 2.7.0 - 2.7.4

External links

http://article.gmane.org/gmane.comp.security.oss.general/12223
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00020.html
http://rhn.redhat.com/errata/RHSA-2014-0247.html
http://secunia.com/advisories/57254
http://secunia.com/advisories/57260
http://secunia.com/advisories/57274
http://secunia.com/advisories/57321
http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3351/focus=3361
http://thread.gmane.org/gmane.comp.security.oss.general/12127
http://bugzilla.redhat.com/show_bug.cgi?id=1069301
http://gitorious.org/gnutls/gnutls/commit/c8dcbedd1fdc312f5b1a70fcfbc1afe235d800cd

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.