INFORMATION BULLETIN

S-296: GnuTLS Security Update

[Red Hat RHSA-2008:0489-5]

May 22, 2008 13:00 GMT


PROBLEM:	Flaws were found in the way GnuTLS handles malicious client connections and it is possible to leverage this flaw to execute arbitrary code.
PLATFORM:	RHEL Desktop Workstation (v. 5 client) Red Hat Enterprise Linux (v. 5 server) Red Hat Enterprise Linux Desktop (v. 5 client)
DAMAGE:	DoS and possible execute arbitrary code.
SOLUTION:	Upgrade to the appropriate version.

VULNERABILITY ASSESSMENT:	The risk is MEDIUM. A malicious remote client could sent a specially crafted request to a service using GnuTLS that could cause the service to crash and it may be possible to execute arbitrary code but they have been unable to prove this at the time of releasing this advisory.

CVSS 2 BASE SCORE: TEMPORAL SCORE: VECTOR:	7.5 5.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C)

LINKS:
CIAC BULLETIN:	http://www.ciac.org/ciac/bulletins/s-296.shtml
ORIGINAL BULLETIN:	https://rhn.redhat.com/errata/RHSA-2008-0489.html
ADDITIONAL LINK:	http://www.debian.org/security/2008/dsa-1581
CVE:	CVE-2008-1948 CVE-2008-1949 CVE-2008-1950

[***** Start Red Hat RHSA-2008:0489-5 *****]

Critical: gnutls security update

Advisory:	RHSA-2008:0489-5
Type:	Security Advisory
Severity:	Critical
Issued on:	2008-05-20
Last updated on:	2008-05-20
Affected Products:	RHEL Desktop Workstation (v. 5 client) Red Hat Enterprise Linux (v. 5 server) Red Hat Enterprise Linux Desktop (v. 5 client)
OVAL:	com.redhat.rhsa-20080489.xml
CVEs (cve.mitre.org):	CVE-2008-1948 CVE-2008-1949 CVE-2008-1950

Details

Updated gnutls packages that fix several security issues are now available
for Red Hat Enterprise Linux 5.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

The GnuTLS Library provides support for cryptographic algorithms and
protocols such as TLS. GnuTLS includes libtasn1, a library developed for
ASN.1 structures management that includes DER encoding and decoding.

Flaws were found in the way GnuTLS handles malicious client connections. A
malicious remote client could send a specially crafted request to a service
using GnuTLS that could cause the service to crash. (CVE-2008-1948,
CVE-2008-1949, CVE-2008-1950)

We believe it is possible to leverage the flaw CVE-2008-1948 to execute
arbitrary code but have been unable to prove this at the time of releasing
this advisory. Red Hat Enterprise Linux 5 includes applications, such as
CUPS, that would be directly vulnerable to any such an exploit, however.
Consequently, we have assigned it critical severity.

Users of GnuTLS are advised to upgrade to these updated packages, which
contain a backported patch that corrects these issues.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

Updated packages

RHEL Desktop Workstation (v. 5 client)

IA-32:
gnutls-devel-1.4.1-3.el5_1.i386.rpm	`ff85af9e0a921178b695b64153083d12`

x86_64:
gnutls-devel-1.4.1-3.el5_1.i386.rpm	`ff85af9e0a921178b695b64153083d12`
gnutls-devel-1.4.1-3.el5_1.x86_64.rpm	`3fcc5ceec14e94c259e2eaa5492e2318`

Red Hat Enterprise Linux (v. 5 server)

SRPMS:
gnutls-1.4.1-3.el5_1.src.rpm	`c7dbb04e62bcfd67c877b4fd9f91be82`

IA-32:
gnutls-1.4.1-3.el5_1.i386.rpm	`d737d8916b444881dd6907dcbd2d20bd`
gnutls-devel-1.4.1-3.el5_1.i386.rpm	`ff85af9e0a921178b695b64153083d12`
gnutls-utils-1.4.1-3.el5_1.i386.rpm	`8f99afe7eb5f06b0fb4670ede2d4c4f5`

IA-64:
gnutls-1.4.1-3.el5_1.i386.rpm	`d737d8916b444881dd6907dcbd2d20bd`
gnutls-1.4.1-3.el5_1.ia64.rpm	`03f46b391136c0cef9b79712ff0bf95b`
gnutls-devel-1.4.1-3.el5_1.ia64.rpm	`337f7512e7e832dd88af0b76461368a6`
gnutls-utils-1.4.1-3.el5_1.ia64.rpm	`105c019612f102bf879be0e53206d51a`

PPC:
gnutls-1.4.1-3.el5_1.ppc.rpm	`9c158fa98dbd772c53a2db14de63695c`
gnutls-1.4.1-3.el5_1.ppc64.rpm	`35e32620c694072dc75ebcf83a702cf0`
gnutls-devel-1.4.1-3.el5_1.ppc.rpm	`fbaba59726e29eb39a58e3b5bec39cde`
gnutls-devel-1.4.1-3.el5_1.ppc64.rpm	`9224f8ffc26c1aebad1a464d380c846f`
gnutls-utils-1.4.1-3.el5_1.ppc.rpm	`7d3508555a4505ac2e8b93b159cc588f`

s390x:
gnutls-1.4.1-3.el5_1.s390.rpm	`3a3a097ac6895e04733bf5ba2a77a238`
gnutls-1.4.1-3.el5_1.s390x.rpm	`0c4accd1300e9778f64ea65f06d94b37`
gnutls-devel-1.4.1-3.el5_1.s390.rpm	`0b3ee4d9213ba4eb85ce857cc56e22be`
gnutls-devel-1.4.1-3.el5_1.s390x.rpm	`cdf5e42f1f7b0e6e187cf01f4637c2f8`
gnutls-utils-1.4.1-3.el5_1.s390x.rpm	`ecd0b113e21771c0b470d01cb580650a`

x86_64:
gnutls-1.4.1-3.el5_1.i386.rpm	`d737d8916b444881dd6907dcbd2d20bd`
gnutls-1.4.1-3.el5_1.x86_64.rpm	`5a284211f10479f2b78a8197119a37a1`
gnutls-devel-1.4.1-3.el5_1.i386.rpm	`ff85af9e0a921178b695b64153083d12`
gnutls-devel-1.4.1-3.el5_1.x86_64.rpm	`3fcc5ceec14e94c259e2eaa5492e2318`
gnutls-utils-1.4.1-3.el5_1.x86_64.rpm	`f4d83a41709bcf86f4dd888eb49bfe83`

Red Hat Enterprise Linux Desktop (v. 5 client)

SRPMS:
gnutls-1.4.1-3.el5_1.src.rpm	`c7dbb04e62bcfd67c877b4fd9f91be82`

IA-32:
gnutls-1.4.1-3.el5_1.i386.rpm	`d737d8916b444881dd6907dcbd2d20bd`
gnutls-utils-1.4.1-3.el5_1.i386.rpm	`8f99afe7eb5f06b0fb4670ede2d4c4f5`

x86_64:
gnutls-1.4.1-3.el5_1.i386.rpm	`d737d8916b444881dd6907dcbd2d20bd`
gnutls-1.4.1-3.el5_1.x86_64.rpm	`5a284211f10479f2b78a8197119a37a1`
gnutls-utils-1.4.1-3.el5_1.x86_64.rpm	`f4d83a41709bcf86f4dd888eb49bfe83`

(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

447461 - CVE-2008-1948 GNUTLS-SA-2008-1-1 GnuTLS buffer overflow
447462 - CVE-2008-1949 GNUTLS-SA-2008-1-2 GnuTLS null-pointer dereference
447463 - CVE-2008-1950 GNUTLS-SA-2008-1-3 GnuTLS memory overread flaw

References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1948
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1949
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1950
http://www.redhat.com/security/updates/classification/#critical

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/


[***** End Red Hat RHSA-2008:0489-5 *****]

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