Buffer overflow in GnuTLS

1) Buffer overflow

EUVDB-ID: #VU32530

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-3466

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

Buffer overflow in the read_server_hello function in lib/gnutls_handshake.c in GnuTLS before 3.1.25, 3.2.x before 3.2.15, and 3.3.x before 3.3.4 allows remote servers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a long session id in a ServerHello message.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GnuTLS: 3.1.0 - 3.3.3

External links

http://linux.oracle.com/errata/ELSA-2014-0594.html
http://linux.oracle.com/errata/ELSA-2014-0595.html
http://lists.opensuse.org/opensuse-security-announce/2014-06/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2014-06/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2014-06/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2014-06/msg00015.html
http://radare.today/technical-analysis-of-the-gnutls-hello-vulnerability/
http://rhn.redhat.com/errata/RHSA-2014-0594.html
http://rhn.redhat.com/errata/RHSA-2014-0595.html
http://rhn.redhat.com/errata/RHSA-2014-0684.html
http://rhn.redhat.com/errata/RHSA-2014-0815.html
http://secunia.com/advisories/58340
http://secunia.com/advisories/58598
http://secunia.com/advisories/58601
http://secunia.com/advisories/58642
http://secunia.com/advisories/59016
http://secunia.com/advisories/59021
http://secunia.com/advisories/59057
http://secunia.com/advisories/59086
http://secunia.com/advisories/59408
http://secunia.com/advisories/59838
http://secunia.com/advisories/60384
http://www.debian.org/security/2014/dsa-2944
http://www.gnutls.org/security.html
http://www.novell.com/support/kb/doc.php?id=7015302
http://www.novell.com/support/kb/doc.php?id=7015303
http://www.securityfocus.com/bid/67741
http://www.securitytracker.com/id/1030314
http://www.ubuntu.com/usn/USN-2229-1
http://www-01.ibm.com/support/docview.wss?uid=swg21678776
http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5096155
http://bugzilla.redhat.com/show_bug.cgi?id=1101932
http://www.gitorious.org/gnutls/gnutls/commit/688ea6428a432c39203d00acd1af0e7684e5ddfd

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.