Daniel Bleichenbacher discovered a flaw in GNU TLS cryptographic package that could allow an attacker to generate a forged signature that GNU TLS will accept as valid.
For the stable distribution (sarge) this problem has been fixed in version 1.0.16-13.2sarge2.
The unstable distribution (sid) does no longer contain gnutls11, for gnutls13 this problem has been fixed in version 1.4.4-1.
We recommend that you upgrade your GNU TLS package.
MD5 checksums of the listed files are available in the original advisory.