Joined: 12 May 2004
|Posted: Wed May 21, 2008 10:26 pm Post subject: [ GLSA 200805-20 ] GnuTLS: Execution of arbitrary code
|Gentoo Linux Security Advisory
Title: GnuTLS: Execution of arbitrary code (GLSA 200805-20)
Date: May 21, 2008
Multiple vulnerabilities might allow for the execution of arbitrary code in daemons using GnuTLS.
GnuTLS is an implementation of Secure Sockets Layer (SSL) 3.0 and Transport Layer Security (TLS) 1.0, 1.1 and 1.2.
Vulnerable: < 2.2.5
Unaffected: >= 2.2.5
Architectures: All supported architectures
Ossi Herrala and Jukka Taimisto of Codenomicon reported three vulnerabilities in libgnutls of GnuTLS:
- "Client Hello" messages containing an invalid server name can lead to a buffer overflow when evaluating "Security Parameters" (CVE-2008-1948).
- Multiple "Client Hello" messages can lead to a NULL pointer dereference (CVE-2008-1949).
- A TLS handshake including an encrypted "Client Hello" message and an invalid record length could lead to a buffer overread (CVE-2008-1950).
Unauthenticated remote attackers could exploit these vulnerabilities to cause Denial of Service conditions in daemons using GnuTLS. The first vulnerability (CVE-2008-1948) might allow for the execution of arbitrary code with the privileges of the daemon handling incoming TLS connections.
There is no known workaround at this time.
All GnuTLS users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=net-libs/gnutls-2.2.5"