From http://lists.gnu.org/archive/html/help-libtasn1/2015-03/msg00002.html:

GNU Libtasn1 is a standalone library written in C for manipulating ASN.1 objects including DER/BER encoding/decoding. GNU Libtasn1 is used by GnuTLS to handle X.509 structures and by GNU Shishi to handle Kerberos V5 structures.

Noteworthy changes in release 4.4 (released 2015-03-29) [stable] - Corrected a two-byte stack overflow in asn1derdecoding. Reported by Hanno Böck.

Exact commit that fixes this: http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commit;h=4d4f992826a4962790ecd0cce6fbba4a415ce149

CVE request: http://seclists.org/oss-sec/2015/q1/1038

GNU Libtasn1 before 4.19.0 has an ETYPEOK off-by-one array size check that affects asn1encodesimpleder.

Two errors in the "asn1findnode()" function (lib/parseraux.c) within GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-based buffer overflow by tricking a user into processing a specially crafted assignments file via the e.g. asn1Coding utility.

GNU Libtasn1-4.13 libtasn1-4.13 version libtasn1-4.13, libtasn1-4.12 contains a DoS, specifically CPU usage will reach 100% when running asn1Paser against the POC due to an issue in asn1expandobjectid(ptree), after a long time, the program will be killed. This attack appears to be exploitable via parsing a crafted file.

The asn1extractderoctet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1DECODEFLAGSTRICTDER flag, allows remote attackers to cause a denial of service (infinite recursion) via a crafted certificate.

A heap-based buffer overflow flaw was found in the way the libtasn1 library decoded certain DER-encoded input. A specially crafted, DER-encoded input could cause an application using libtasn1 to perform an invalid read, causing the application to crash.

Upstream patch:

http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commitdiff;h=f979435823a02f842c41d49cd41cc81f25b5d677