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Date: | Thu, 25 Mar 2010 11:09:49 -0500 |
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Synopsis: Moderate: gnutls security update
Issue date: 2010-03-25
CVE Names: CVE-2009-2409 CVE-2009-3555 CVE-2010-0731
CVE-2009-3555 TLS: MITM attacks via session renegotiation
CVE-2010-0731 gnutls: gnutls_x509_crt_get_serial incorrect serial
decoding from ASN1 (BE64) [GNUTLS-SA-2010-1]
A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure
Sockets Layer) protocols handled session renegotiation. A
man-in-the-middle attacker could use this flaw to prefix arbitrary plain
text to a client's session (for example, an HTTPS connection to a
website). This could force the server to process an attacker's request
as if authenticated using the victim's credentials. This update
addresses this flaw by implementing the TLS Renegotiation Indication
Extension, as defined in RFC 5746. (CVE-2009-3555)
Refer to the following Knowledgebase article for additional details
about the CVE-2009-3555 flaw: http://kbase.redhat.com/faq/docs/DOC-20491
Dan Kaminsky found that browsers could accept certificates with MD2 hash
signatures, even though MD2 is no longer considered a cryptographically
strong algorithm. This could make it easier for an attacker to create a
malicious certificate that would be treated as trusted by a browser.
GnuTLS now disables the use of the MD2 algorithm inside signatures by
default. (CVE-2009-2409) SL5 Only
A flaw was found in the way GnuTLS extracted serial numbers from X.509
certificates. On 64-bit big endian platforms, this flaw could cause the
certificate revocation list (CRL) check to be bypassed; cause various
GnuTLS utilities to crash; or, possibly, execute arbitrary code.
(CVE-2010-0731) SL4 Only
For the update to take effect, all applications linked to the GnuTLS
library must be restarted, or the system rebooted.
SL 4.x
SRPMS:
gnutls-1.0.20-4.el4_8.7.src.rpm
i386:
gnutls-1.0.20-4.el4_8.7.i386.rpm
gnutls-devel-1.0.20-4.el4_8.7.i386.rpm
x86_64:
gnutls-1.0.20-4.el4_8.7.i386.rpm
gnutls-1.0.20-4.el4_8.7.x86_64.rpm
gnutls-devel-1.0.20-4.el4_8.7.x86_64.rpm
SL 5.x
SRPMS:
gnutls-1.4.1-3.el5_4.8.src.rpm
i386:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm
gnutls-utils-1.4.1-3.el5_4.8.i386.rpm
x86_64:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-utils-1.4.1-3.el5_4.8.x86_64.rpm
-Connie Sieh
-Troy Dawson
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