Source:

http://www.gnutls.org/security.html

Info:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1573

gnutls_cipher.c in libgnutls in GnuTLS before 2.12.17 and 3.x before 3.0.15 

does not properly handle data encrypted with a block cipher, which allows 

remote attackers to cause a denial of service (heap memory corruption and 

application crash) via a crafted record, as demonstrated by a crafted 

GenericBlockCipher structure.

Status:

Need to determine if this patch has been sent upstream.

--- gnutls-2.8.6/lib/gnutls_cipher.c.orig	Mon Nov  2 18:30:39 2009

+++ gnutls-2.8.6/lib/gnutls_cipher.c	Fri Apr  6 11:09:15 2012

@@ -502,12 +502,12 @@

 	  ciphertext.size -= blocksize;

 	  ciphertext.data += blocksize;

-	  if (ciphertext.size == 0)

-	    {

-	      gnutls_assert ();

-	      return GNUTLS_E_DECRYPTION_FAILED;

-	    }

 	}

+      if (ciphertext.size < hash_size)

+	{

+	  gnutls_assert ();

+	  return GNUTLS_E_DECRYPTION_FAILED;

+	}

       pad = ciphertext.data[ciphertext.size - 1] + 1;	/* pad */