#VU32801 Cryptographic issues in GnuTLS - CVE-2012-1573

Vulnerability identifier: #VU32801

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-1573

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GnuTLS
Universal components / Libraries / Libraries used by multiple products

Vendor: GnuTLS

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

gnutls_cipher.c in libgnutls in GnuTLS before 2.12.17 and 3.x before 3.0.15 does not properly handle data encrypted with a block cipher, which allows remote attackers to cause a denial of service (heap memory corruption and application crash) via a crafted record, as demonstrated by a crafted GenericBlockCipher structure.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GnuTLS: 2.12.0 - 3.0.14

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External links
https://archives.neohapsis.com/archives/bugtraq/2012-03/0099.html
https://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/5910
https://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/5912
https://blog.mudynamics.com/2012/03/20/gnutls-and-libtasn1-vulns/
https://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commit;h=422214868061370aeeb0ac9cd0f021a5c350a57d
https://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commit;h=b495740f2ff66550ca9395b3fda3ea32c3acb185
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077071.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-March/076496.html
https://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
https://osvdb.org/80259
https://rhn.redhat.com/errata/RHSA-2012-0429.html
https://rhn.redhat.com/errata/RHSA-2012-0488.html
https://rhn.redhat.com/errata/RHSA-2012-0531.html
https://secunia.com/advisories/48488
https://secunia.com/advisories/48511
https://secunia.com/advisories/48596
https://secunia.com/advisories/48712
https://secunia.com/advisories/57260
https://www.debian.org/security/2012/dsa-2441
https://www.gnu.org/software/gnutls/security.html
https://www.mandriva.com/security/advisories?name=MDVSA-2012:040
https://www.openwall.com/lists/oss-security/2012/03/21/4
https://www.openwall.com/lists/oss-security/2012/03/21/5
https://www.securityfocus.com/bid/52667
https://www.securitytracker.com/id?1026828
https://www.ubuntu.com/usn/USN-1418-1
https://bugzilla.redhat.com/show_bug.cgi?id=805432

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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.