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Red Hat Enterprise Linux: RHSA-2012:0086-01 Moderate: OpenSSL DoS Attack

red hat
Calendar Grey February 1, 2012
Dist Redhat Esm H88
Recent enhancements to OpenSSL address two vulnerabilities within Red Hat Enterprise Linux. Critical security patch advised for users.
Updated openssl packages that fix two security issues are now available for Red Hat Enterprise Linux 4

Solution

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

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Summary

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols, as well as a full-strength, general purpose cryptography library.
An information leak flaw was found in the SSL 3.0 protocol implementation in OpenSSL. Incorrect initialization of SSL record padding bytes could cause an SSL client or server to send a limited amount of possibly sensitive data to its SSL peer via the encrypted connection. (CVE-2011-4576)
It was discovered that OpenSSL did not limit the number of TLS/SSL handshake restarts required to support Server Gated Cryptography. A remote attacker could use this flaw to make a TLS/SSL server using OpenSSL consume an excessive amount of CPU by continuously restarting the handshake. (CVE-2011-4619)
All OpenSSL users should upgrade to these updated packages, which contain backported patches to resolve these issues. For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.

Topics%20covered

Topics Covered

security advisory moderate information leak DoS attack Red Hat Enterprise Linux openssl CPU consumption

References

https://access.redhat.com/security/cve/CVE-2011-4576 https://access.redhat.com/security/cve/CVE-2011-4619 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux AS version 4:
Source:
i386: openssl-0.9.7a-43.18.el4.i386.rpm openssl-0.9.7a-43.18.el4.i686.rpm openssl-debuginfo-0.9.7a-43.18.el4.i386.rpm openssl-debuginfo-0.9.7a-43.18.el4.i686.rpm openssl-devel-0.9.7a-43.18.el4.i386.rpm openssl-perl-0.9.7a-43.18.el4.i386.rpm
ia64: openssl-0.9.7a-43.18.el4.i686.rpm openssl-0.9.7a-43.18.el4.ia64.rpm openssl-debuginfo-0.9.7a-43.18.el4.i686.rpm openssl-debuginfo-0.9.7a-43.18.el4.ia64.rpm openssl-devel-0.9.7a-43.18.el4.ia64.rpm openssl-perl-0.9.7a-43.18.el4.ia64.rpm
ppc: openssl-0.9.7a-43.18.el4.ppc.rpm openssl-0.9.7a-43.18.el4.ppc64.rpm openssl-debuginfo-0.9.7a-43.18.el4.ppc.rpm openssl-debuginfo-0.9.7a-43.18.el4.ppc64.rpm openssl-devel-0.9.7a-43.18.el4.ppc.rpm openssl-devel-0.9.7a-43.18.el4.ppc64.rpm openssl-perl-0.9.7a-43.18.el4.ppc.rpm
s390: openssl-0.9.7a-43.18.el4.s390.rpm openssl-debuginfo-0.9.7a-43.18.el4.s390.rpm openssl-devel-0.9.7a-43.18.el4.s390.rpm openssl-perl-0.9.7a-43.18.el4.s390.rpm
s390x: openssl-0.9.7a-43.18.el4.s390.rpm openssl-0.9.7a-43.18.el4.s390x.rpm openssl-debuginfo-0.9.7a-43.18.el4.s390.rpm openssl-debuginfo-0.9.7a-43.18.el4.s390x.rpm openssl-devel-0.9.7a-43.18.el4.s390.rpm openssl-devel-0.9.7a-43.18.el4.s390x.rpm openssl-perl-0.9.7a-43.18.el4.s390x.rpm
x86_64:

Read the Full Advisory


Advisory ID: RHSA-2012:0086-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0086.html
Issue date: 2012-02-01

Topic

Updated openssl packages that fix two security issues are now available forRed Hat Enterprise Linux 4.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate information leak DoS attack Red Hat Enterprise Linux openssl CPU consumption

Relevant Releases Architectures

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64

Red Hat Enterprise Linux Desktop version 4 - i386, x86_64

Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64

Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

Bugs Fixed

771775 - CVE-2011-4576 openssl: uninitialized SSL 3.0 padding

771780 - CVE-2011-4619 openssl: SGC restart DoS attack

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