#VU44184 Input validation error in GnuTLS and libtASN1 - CVE-2012-1569

Vulnerability identifier: #VU44184

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-2012-1569

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GnuTLS
Universal components / Libraries / Libraries used by multiple products
libtASN1
Universal components / Libraries / Libraries used by multiple products

Vendor: GnuTLS
GNU

Description

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

The asn1_get_length_der function in decoding.c in GNU Libtasn1 before 2.12, as used in GnuTLS before 3.0.16 and other products, does not properly handle certain large length values, which allows remote attackers to cause a denial of service (heap memory corruption and application crash) or possibly have unspecified other impact via a crafted ASN.1 structure.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GnuTLS: 1.0.16 - 3.0.14

libtASN1: 0.1.0 - 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/5932
https://article.gmane.org/gmane.comp.gnu.libtasn1.general/53
https://article.gmane.org/gmane.comp.gnu.libtasn1.general/54
https://blog.mudynamics.com/2012/03/20/gnutls-and-libtasn1-vulns/
https://linux.oracle.com/errata/ELSA-2014-0596.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/076856.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/076865.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077284.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/077339.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-April/078207.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-March/076699.html
https://lists.opensuse.org/opensuse-security-announce/2014-03/msg00001.html
https://rhn.redhat.com/errata/RHSA-2012-0427.html
https://rhn.redhat.com/errata/RHSA-2012-0488.html
https://rhn.redhat.com/errata/RHSA-2012-0531.html
https://secunia.com/advisories/48397
https://secunia.com/advisories/48488
https://secunia.com/advisories/48505
https://secunia.com/advisories/48578
https://secunia.com/advisories/48596
https://secunia.com/advisories/49002
https://secunia.com/advisories/50739
https://secunia.com/advisories/57260
https://www.debian.org/security/2012/dsa-2440
https://www.gnu.org/software/gnutls/security.html
https://www.mandriva.com/security/advisories?name=MDVSA-2012:039
https://www.openwall.com/lists/oss-security/2012/03/20/3
https://www.openwall.com/lists/oss-security/2012/03/20/8
https://www.openwall.com/lists/oss-security/2012/03/21/5
https://www.securitytracker.com/id?1026829
https://www.ubuntu.com/usn/USN-1436-1
https://bugzilla.redhat.com/show_bug.cgi?id=804920

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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.