svn commit: r41998 - head/share/security/advisories
Xin LI
delphij at FreeBSD.org
Fri Jun 21 21:41:49 UTC 2013
Author: delphij
Date: Fri Jun 21 21:41:48 2013
New Revision: 41998
URL: http://svnweb.freebsd.org/changeset/doc/41998
Log:
Commit revised advisory for 13:06.mmap.
Modified:
head/share/security/advisories/FreeBSD-SA-13:06.mmap.asc
Modified: head/share/security/advisories/FreeBSD-SA-13:06.mmap.asc
==============================================================================
--- head/share/security/advisories/FreeBSD-SA-13:06.mmap.asc Fri Jun 21 17:57:26 2013 (r41997)
+++ head/share/security/advisories/FreeBSD-SA-13:06.mmap.asc Fri Jun 21 21:41:48 2013 (r41998)
@@ -13,14 +13,20 @@ Announced: 2013-06-18
Credits: Konstantin Belousov
Alan Cox
Affects: FreeBSD 9.0 and later
-Corrected: 2013-06-18 09:04:19 UTC (stable/9, 9.1-STABLE)
- 2013-06-18 09:05:51 UTC (releng/9.1, 9.1-RELEASE-p4)
+Corrected: 2013-06-18 07:04:19 UTC (stable/9, 9.1-STABLE)
+ 2013-06-18 07:05:51 UTC (releng/9.1, 9.1-RELEASE-p4)
CVE Name: CVE-2013-2171
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.
+0. Revision History
+
+v1.0 2013-06-18 Initial release.
+v1.1 2013-06-21 Corrected correction date.
+ Added workaround information.
+
I. Background
The FreeBSD virtual memory system allows files to be memory-mapped.
@@ -51,7 +57,23 @@ arbitrary code with user privileges on t
IV. Workaround
-No workaround is available.
+Systems that do not allow unprivileged users to use the ptrace(2)
+system call are not vulnerable, this can be accomplished by setting
+the sysctl variable security.bsd.unprivileged_proc_debug to zero.
+Please note that this will also prevent debugging tools, for instance
+gdb, truss, procstat, as well as some built-in debugging facilities in
+certain scripting language like PHP, etc., from working for unprivileged
+users.
+
+The following command will set the sysctl accordingly and works until the
+next reboot of the system:
+
+ sysctl security.bsd.unprivileged_proc_debug=0
+
+To make this change persistent across reboot, the system administrator
+should also add the setting into /etc/sysctl.conf:
+
+ echo 'security.bsd.unprivileged_proc_debug=0' >> /etc/sysctl.conf
V. Solution
@@ -112,16 +134,13 @@ Or visit the following URL, replacing XX
VII. References
-<other info on vulnerability>
-
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-2171>
The latest revision of this advisory is available at
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-13:06.mmap.asc>
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