Moderate CentOS tcl Update


tcl-8.4.13-6.el5.i386.rpm, tcl-8.4.13-6.el5.src.rpm, tcl-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, tcl-html-8.4.13-6.el5.i386.rpm, tcl-html-8.4.13-6.el5.x86_64.rpm
CVE-2007-4772, CVE-2007-6067,,
2017-07-27 19:04
CVE-2007-4772 tcl8.4
CVE-2007-6067 tcl8.4
2017-04-01 19:06
2017-01-05 20:10


Updated tcl packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

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.
Please see

Am I vulnerable?

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Affected package information

Release Package Patched in
5 tcl tcl-8.4.13-6.el5.i386.rpm
tcl tcl-8.4.13-6.el5.src.rpm
tcl tcl-8.4.13-6.el5.x86_64.rpm
tcl-devel tcl-devel-8.4.13-6.el5.x86_64.rpm
tcl-devel tcl-devel-8.4.13-6.el5.i386.rpm
tcl-html tcl-html-8.4.13-6.el5.x86_64.rpm
tcl-html tcl-html-8.4.13-6.el5.i386.rpm