Description
lib/pk-libgcrypt.c in libgnutls in GnuTLS before 2.6.6 does not properly handle invalid DSA signatures, which allows remote attackers to cause a denial of service (application crash) and possibly have unspecified other impact via a malformed DSA key that triggers a (1) free of an uninitialized pointer or (2) double free.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- GnuTLS 2.6.x - libgnutls lib/pk-libgcrypt.c Malformed DSA Key Handling Remote Denial of Service EDB-32964 · dos · Apr 30, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- gnutls-libgnutls-dos(50445) vdb-entry
- [gnutls-devel] 20090423 Re: some crashes on using DSA keys mailing-list
- [gnutls-devel] 20090430 Double free and free of invalid pointer on certain errors [GNUTLS-SA-2009-1] [CVE-2009-1415] mailing-list
- gnutls-dsa-code-execution(50257) vdb-entry
- http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/3488
- gnutls-dsa-dos(50260) vdb-entry
- ADV-2009-1218 vdb-entry
- 34783 vdb-entry
- GLSA-200905-04 vendor-advisory
- 1022157 vdb-entry
- 34842 third-party-advisory
- 35211 third-party-advisory
- MDVSA-2009:116 vendor-advisory