Integer underflow in the ksba_oid_to_str function in Libksba before 1.3.2, as used in GnuPG, allows remote attackers to cause a denial of service (crash) via a crafted OID in a (1) S/MIME message or (2) ECC based OpenPGP data, which triggers a buffer overflow.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-9087
• https://blog.fuzzing-project.org/2-Buffer-overflow-and-other-minor-issues-in-GnuPG-and-libksba-TFPA-0012014.html
• http://advisories.mageia.org/MGASA-2014-0498.html
• http://lists.gnupg.org/pipermail/gnupg-announce/2014q4/000359.html
• http://secunia.com/advisories/60073
• http://secunia.com/advisories/60189
• http://secunia.com/advisories/60233
• http://www.debian.org/security/2014/dsa-3078
• http://www.mandriva.com/security/advisories?name=MDVSA-2014:234
• http://www.mandriva.com/security/advisories?name=MDVSA-2015:151
• http://www.securityfocus.com/bid/71285
• http://www.ubuntu.com/usn/USN-2427-1