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RHEL 5: RHSA-2013:0122-01 Moderate: Tcl DoS Issues Update

red hat
Calendar Grey January 8, 2013
Dist Redhat Esm H88
Essential patch rollout for tcl modules targeting vulnerabilities and system flaws in Red Hat Enterprise Linux 5.
Updated tcl packages that fix two security issues and one bug are now available for Red Hat Enterprise Linux 5

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/knowledge/articles/11258

Summary

Tcl (Tool Command Language) provides a powerful platform for creating integration applications that tie together diverse applications, protocols, devices, and frameworks. When paired with the Tk toolkit, Tcl provides a fast and powerful way to create cross-platform GUI applications.
Two denial of service flaws were found in the Tcl regular expression handling engine. If Tcl or an application using Tcl processed a specially-crafted regular expression, it would lead to excessive CPU and memory consumption. (CVE-2007-4772, CVE-2007-6067)
This update also fixes the following bug:
* Due to a suboptimal implementation of threading in the current version of the Tcl language interpreter, an attempt to use threads in combination with fork in a Tcl script could cause the script to stop responding. At the moment, it is not possible to rewrite the source code or drop support for threading entirely. Consequent to this, this update provides a version of Tcl without threading support in addition to the standard version with this support. Users who need to use fork in their Tcl scripts and do not require threading can now switch to the version without threading support by using the alternatives command. (BZ#478961)
All users of Tcl are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Topics%20covered

Topics Covered

security advisory moderate denial of service update bug fix Red Hat Enterprise Linux tcl

References

https://access.redhat.com/security/cve/CVE-2007-4772 https://access.redhat.com/security/cve/CVE-2007-6067 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: tcl-8.4.13-6.el5.i386.rpm tcl-debuginfo-8.4.13-6.el5.i386.rpm tcl-html-8.4.13-6.el5.i386.rpm
x86_64: tcl-8.4.13-6.el5.i386.rpm tcl-8.4.13-6.el5.x86_64.rpm tcl-debuginfo-8.4.13-6.el5.i386.rpm tcl-debuginfo-8.4.13-6.el5.x86_64.rpm tcl-html-8.4.13-6.el5.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386: tcl-debuginfo-8.4.13-6.el5.i386.rpm tcl-devel-8.4.13-6.el5.i386.rpm
x86_64: tcl-debuginfo-8.4.13-6.el5.i386.rpm tcl-debuginfo-8.4.13-6.el5.x86_64.rpm tcl-devel-8.4.13-6.el5.i386.rpm tcl-devel-8.4.13-6.el5.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: tcl-8.4.13-6.el5.i386.rpm tcl-debuginfo-8.4.13-6.el5.i386.rpm tcl-devel-8.4.13-6.el5.i386.rpm tcl-html-8.4.13-6.el5.i386.rpm
ia64: tcl-8.4.13-6.el5.ia64.rpm tcl-debuginfo-8.4.13-6.el5.ia64.rpm tcl-devel-8.4.13-6.el5.ia64.rpm tcl-html-8.4.13-6.el5.ia64.rpm
ppc: tcl-8.4.13-6.el5.ppc.rpm tcl-8.4.13-6.el5.ppc64.rpm tcl-debuginfo-8.4.13-6.el5.ppc.rpm tcl-debuginfo-8.4.13-6.el5.ppc64.rpm tcl-devel-8.4.13-6.el5.ppc.rpm tcl-devel-8.4.13-6.el5.ppc64.rpm tcl-html-8.4.13-6.el5.ppc.rpm
s390x: tcl-8.4.13-6.el5.s390.rpm tcl-8.4.13-6.el5.s390x.rpm tcl-debuginfo-8.4.13-6.el5.s390.rpm tcl-debuginfo-8.4.13-6.el5.s390x.rpm

Read the Full Advisory


Advisory ID: RHSA-2013:0122-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2013:0122.html
Issue date: 2013-01-08

Topic

Updated tcl packages that fix two security issues and one bug are nowavailable for Red Hat Enterprise Linux 5.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 denial of service update bug fix Red Hat Enterprise Linux tcl

Relevant Releases Architectures

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Bugs Fixed

316511 - CVE-2007-4772 postgresql DoS via infinite loop in regex NFA optimization code

400931 - CVE-2007-6067 postgresql: tempory DoS caused by slow regex NFA cleanup

478961 - [RHEL5] tcl threads support implementation can cause scripts to hang

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