GnuTLS _gnutls_recv_client_kx_message() denial of service

gnutls-gnutlsrecvclientkxmessage-dos (42530)

High Risk

Description:

GnuTLS is vulnerable to a denial of service, caused by a NULL pointer dereference in the _gnutls_recv_client_kx_message function. By sending a TLS record containing multiple Client Hello handshake messages, a remote attacker could cause the service to crash.

Platforms Affected:

• Canonical, Ubuntu 6.06 LTS
• Canonical, Ubuntu 7.04
• Canonical, Ubuntu 7.10
• Canonical, Ubuntu 8.04 LTS
• Gentoo, Linux
• GNU, GnuTLS 1.0.18
• GNU, GnuTLS 1.0.19
• GNU, GnuTLS 1.0.20
• GNU, GnuTLS 1.0.21
• GNU, GnuTLS 1.0.22
• GNU, GnuTLS 1.0.23
• GNU, GnuTLS 1.0.24
• GNU, GnuTLS 1.0.25
• GNU, GnuTLS 1.1.13
• GNU, GnuTLS 1.1.14
• GNU, GnuTLS 1.1.15
• GNU, GnuTLS 1.1.16
• GNU, GnuTLS 1.1.17
• GNU, GnuTLS 1.1.18
• GNU, GnuTLS 1.1.19
• GNU, GnuTLS 1.1.20
• GNU, GnuTLS 1.1.21
• GNU, GnuTLS 1.1.22
• GNU, GnuTLS 1.1.23
• GNU, GnuTLS 1.2.0
• GNU, GnuTLS 1.2.1
• GNU, GnuTLS 1.2.10
• GNU, GnuTLS 1.2.11
• GNU, GnuTLS 1.2.2
• GNU, GnuTLS 1.2.3
• GNU, GnuTLS 1.2.4
• GNU, GnuTLS 1.2.5
• GNU, GnuTLS 1.2.6
• GNU, GnuTLS 1.2.7
• GNU, GnuTLS 1.2.8
• GNU, GnuTLS 1.2.9
• GNU, GnuTLS 1.3.0
• GNU, GnuTLS 1.3.1
• GNU, GnuTLS 1.3.2
• GNU, GnuTLS 1.3.3
• GNU, GnuTLS 1.3.4
• GNU, GnuTLS 1.3.5
• GNU, GnuTLS 1.4.0
• GNU, GnuTLS 1.4.1
• GNU, GnuTLS 1.4.5
• GNU, GnuTLS 1.6.3
• GNU, GnuTLS 2.0.4
• GNU, GnuTLS 2.2.0
• GNU, GnuTLS 2.2.1
• GNU, GnuTLS 2.2.2
• GNU, GnuTLS 2.2.3
• MandrakeSoft, Mandrake Linux 2007.1
• MandrakeSoft, Mandrake Linux 2007.1 X86_64
• MandrakeSoft, Mandrake Linux 2008.0
• MandrakeSoft, Mandrake Linux 2008.0 X86_64
• MandrakeSoft, Mandrake Linux 2008.1 X86_64
• MandrakeSoft, Mandrake Linux 2008.1
• MandrakeSoft, Mandrake Linux Corporate Server 4.0
• MandrakeSoft, Mandrake Linux Corporate Server 4.0 X86_64
• Novell, Linux Desktop 9
• Novell, Linux POS 9
• Novell, Open Enterprise Server
• Novell, OpenSUSE 10.2
• Novell, OpenSUSE 10.3
• Novell, OpenSUSE 11.0
• Novell, SUSE Linux Enterprise 10 SP2 DEBUGINFO
• Novell, SUSE Linux Enterprise Desktop 10 SP1
• Novell, SUSE Linux Enterprise Desktop 10 SP2
• Novell, SUSE Linux Enterprise Server 10 SP1
• Novell, SUSE Linux Enterprise Server 10 SP2
• RedHat, Enterprise Linux 4 ES
• RedHat, Enterprise Linux 4 WS
• RedHat, Enterprise Linux 4 Desktop
• RedHat, Enterprise Linux 4 AS
• RedHat, Enterprise Linux 5
• RedHat, Enterprise Linux 5 Client Workstation
• RedHat, Enterprise Linux 5 Client
• SuSE, SuSE SLES 9
• VideoLAN, VLC 0.8.6g

Remedy:

Upgrade to the latest version of GnuTLS (2.2.5 or later), available from the GNU TLS Library Project Web site. See References.

For other distributions:
Apply the appropriate update for your system. See References.

Consequences:

Denial of Service

References:

• BugTraq Mailing List, Tue May 20 2008 - 09:17:09 CDT, Vulnerability Advisory on GnuTLS at http://archives.neohapsis.com/archives/bugtraq/2008-05/0230.html.
• FICORA #130447, CERT-FI Vulnerability Advisory on GnuTLS at http://www.cert.fi/haavoittuvuudet/advisory-gnutls.html.
• GNU TLS Library Project Web site, The GNU Transport Layer Security Library at http://www.gnu.org/software/gnutls/download.html.
• gnutls-devel Mailing List, Mon, 19 May 2008 22:54:43 +0200, GnuTLS 2.2.5 - Brown paper bag release at http://lists.gnu.org/archive/html/gnutls-devel/2008-05/msg00060.html.
• VideoLAN Web site, Changes between 0.8.6g and 0.8.6h at http://wiki.videolan.org/Changelog/0.8.6h.
• ASA-2008-261: gnutls security update (RHSA-2008-0492)
• BID-29292: GnuTLS Prior to 2.2.5 Multiple Remote Vulnerabilities
• CVE-2008-1949: The _gnutls_recv_client_kx_message function in lib/gnutls_kx.c in libgnutls in gnutls-serv in GnuTLS before 2.2.4 continues to process Client Hello messages within a TLS message after one has already been processed, which allows remote attackers to cause a denial of service (NULL dereference and crash) via a TLS message containing multiple Client Hello messages, aka GNUTLS-SA-2008-1-2.
• FrSIRT/ADV-2008-1582: GnuTLS Data Handling Buffer Overflow and Denial of Service Issues
• FrSIRT/ADV-2008-1583: FileZilla GnuTLS Buffer Overflow and Denial of Service Vulnerabilities
• FrSIRT/ADV-2008-1762: VLC Security Update Fixes GnuTLS and Libxml2 Vulnerabilities
• GLSA-200805-20: GnuTLS: Execution of arbitrary code
• MDVSA-2008:106: Updated gnutls packages fix denial of service vulnerabilities
• RHSA-2008-0489: Critical: gnutls security update
• RHSA-2008-0492: Important: gnutls security update
• SA30287: GnuTLS Multiple Vulnerabilities
• SA30330: FileZilla GnuTLS Multiple Vulnerabilities
• SA30560: VLC Media Player GnuTLS and Libxml2 Vulnerabilities
• SECTRACK ID: 1020058: GnuTLS Null Pointer Dereference in Processing Client Hello Messages Lets Remote Users Deny Service
• SUSE-SA:2008:046: gnutls security problems
• US-CERT VU#252626: GnuTLS Client Hello repeat Denial of Service
• USN-613-1: GnuTLS vulnerabilities

Reported:

May 19, 2008

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