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Red Hat Enterprise Linux 6 RHSA-2017:0574 Moderate: gnutls DoS Threat

red hat
Calendar Grey March 21, 2017
Scroller Redhat
Fedora releases an essential security update for openssl tackling multiple vulnerabilities and enhancements for Enterprise Linux 8.
An update for gnutls is now available for Red Hat Enterprise Linux 6

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.
The following packages have been upgraded to a later upstream version: gnutls (2.12.23). (BZ#1321112, BZ#1326073, BZ#1415682, BZ#1326389)
Security Fix(es):
* A denial of service flaw was found in the way the TLS/SSL protocol defined processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make a TLS/SSL server consume an excessive amount of CPU and fail to accept connections form other clients. (CVE-2016-8610)
* Multiple flaws were found in the way gnutls processed OpenPGP certificates. An attacker could create specially crafted OpenPGP certificates which, when parsed by gnutls, would cause it to crash. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate encryption DoS security fix Red Hat Enterprise Linux gnutls

References

https://access.redhat.com/security/cve/CVE-2016-8610 https://access.redhat.com/security/cve/CVE-2017-5335 https://access.redhat.com/security/cve/CVE-2017-5336 https://access.redhat.com/security/cve/CVE-2017-5337 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: gnutls-2.12.23-21.el6.src.rpm
i386: gnutls-2.12.23-21.el6.i686.rpm gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-utils-2.12.23-21.el6.i686.rpm
x86_64: gnutls-2.12.23-21.el6.i686.rpm gnutls-2.12.23-21.el6.x86_64.rpm gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-debuginfo-2.12.23-21.el6.x86_64.rpm gnutls-utils-2.12.23-21.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-devel-2.12.23-21.el6.i686.rpm gnutls-guile-2.12.23-21.el6.i686.rpm
x86_64: gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-debuginfo-2.12.23-21.el6.x86_64.rpm gnutls-devel-2.12.23-21.el6.i686.rpm gnutls-devel-2.12.23-21.el6.x86_64.rpm gnutls-guile-2.12.23-21.el6.i686.rpm gnutls-guile-2.12.23-21.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: gnutls-2.12.23-21.el6.src.rpm
x86_64: gnutls-2.12.23-21.el6.i686.rpm gnutls-2.12.23-21.el6.x86_64.rpm gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-debuginfo-2.12.23-21.el6.x86_64.rpm gnutls-utils-2.12.23-21.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: gnutls-debuginfo-2.12.23-21.el6.i686.rpm gnutls-debuginfo-2.12.23-21.el6.x86_64.rpm gnutls-devel-2.12.23-21.el6.i686.rpm gnutls-devel-2.12.23-21.el6.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2017:0574-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0574.html
Issue date: 2017-03-21

Topic

An update for gnutls is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate encryption DoS security fix Red Hat Enterprise Linux gnutls

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

Bugs Fixed

1320982 - ASSERT failure in gnutls-cli-debug

1321112 - DHE_DSS ciphers don't work with client certificates and OpenSSL using TLSv1.2

1323215 - gnutls-serv --http crashes with client certificates with NSS client

1326073 - GnuTLS prefers SHA-1 signatures in TLSv1.2

1326389 - GnuTLS server does not accept SHA-384 and SHA-512 Certificate Verify signatures despite advertising support for them

1326886 - GnuTLS server rejects connections that do not advertise support for SHA-1 signature algorithms

1327656 - gnutls-serv: closing connection without sending an Alert message

1328205 - gnutls-cli won't send certificates that don't match hashes in Certificate Request

1333521 - Provide ability to set the expected server name in gnutls-serv utility

1335924 - gnutls: Disable TLS connections with less than 1024-bit DH parameters1337460 - Disable/remove export ciphersuites in GnuTLS

1384743 - CVE-2016-8610 SSL/TLS: Malformed plain-text ALERT packets could cause remote DoS

1411836 - CVE-2017-5337 gnutls: Heap read overflow in read-packet.c

1412235 - CVE-2017-5335 gnutls: Out of memory while parsing crafted OpenPGP certificate

1412236 - CVE-2017-5336 gnutls: Stack overflow in cdk_pk_get_keyid

1415682 - Changes introduced by rebase to 2.12.23 break API and ABI compatibility for some libraries

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