Multiple vulnerabilities have been identified in GnuTLS, which could be exploited by remote attackers to cause a denial of service or compromise an affected system.
The first issue is caused by a NULL pointer dereference error when processing TLS packets containing multiple "Client Hello" messages, which could be exploited by unauthenticated attackers to crash a vulnerable application.
The second vulnerability is caused by a buffer overflow error when processing certain "Client Hello" messages containing a Server name extension, which could be exploited by unauthenticated attackers to crash an affected application or execute arbitrary code.
The third issue is caused by an error in the "_gnutls_ciphertext2compressed()" [lib/gnutls_cipher.c] function when handling encrypted TLS data containig invalid Record lengths, which could be exploited by unauthenticated remote attackers to crash a vulnerable application.
Credits
Vulnerabilities reported by Ossi Herrala and Jukka Taimisto (CROSS project at Codenomicon Ltd) via CERT-FI.
ChangeLog
2008-05-21 : Initial release
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