The _gnutls_x509_verify_certificate function in lib/x509/verify.c in libgnutls in GnuTLS before 2.6.1 trusts certificate chains in which the last certificate is an arbitrary trusted, self-signed certificate, which allows man-in-the-middle attackers to insert a spoofed certificate for any Distinguished Name (DN).
The product does not validate, or incorrectly validates, a certificate.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gnutls | Gnu | * | 2.6.1 (excluding) |
| Red Hat Enterprise Linux 5 | RedHat | gnutls-0:1.4.1-3.el5_2.1 | * |
| Gnutls11 | Ubuntu | dapper | * |
| Gnutls12 | Ubuntu | dapper | * |
| Gnutls13 | Ubuntu | gutsy | * |
| Gnutls13 | Ubuntu | hardy | * |
| Gnutls26 | Ubuntu | intrepid | * |
| Gnutls26 | Ubuntu | upstream | * |