Red Hat Bugzilla – Full Text Bug Listing
|Summary:||CVE-2012-2186 Asterisk: Asterisk Manager User Unauthorized Shell Access|
|Product:||[Other] Security Response||Reporter:||Kurt Seifried <kseifried>|
|Component:||vulnerability||Assignee:||Red Hat Product Security <security-response-team>|
|Status:||CLOSED ERRATA||QA Contact:|
|Version:||unspecified||CC:||itamar, jeff, lmadsen, rbryant|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2012-12-11 04:09:20 EST||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Bug Depends On:||853543, 853545, 853546|
Description Kurt Seifried 2012-08-31 15:50:27 EDT
AST-2012-012 The AMI Originate action can allow a remote user to specify information that can be used to execute shell commands on the system hosting Asterisk. This can result in an unwanted escalation of permissions, as the Originate action, which requires the “originate” class authorization, can be used to perform actions that would typically require the “system” class authorization. Previous attempts to prevent this permission escalation (AST-2011-006, AST-2012-004) have sought to do so by inspecting the names of applications and functions passed in with the Originate action and, if those applications/functions matched a predefined set of values, rejecting the command if the user lacked the “system” class authorization. As reported by IBM X-Force Research, the “ExternalIVR” application is not listed in the predefined set of values. The solution for this particular vulnerability is to include the “ExternalIVR” application in the set of defined applications/functions that require “system” class authorization. Unfortunately, the approach of inspecting fields in the Originate action against known applications/functions has a significant flaw. The predefined set of values can be bypassed by creative use of the Originate action or by certain dialplan configurations, which is beyond the ability of Asterisk to analyze at run-time. Attempting to work around these scenarios would result in severely restricting the applications or functions and prevent their usage for legitimate means. As such, any additional security vulnerabilities, where an application/function that would normally require the “system” class authorization can be executed by users with the “originate” class authorization, will not be addressed. Instead, the READMESERIOUSLY.bestpractices.txt file has been updated to reflect that the AMI Originate action can result in commands requiring the “system” class authorization to be executed. Proper system configuration can limit the impact of such scenarios. This was originally reported by Zubair Ashraf of IBM X-Force Research http://downloads.asterisk.org/pub/security/AST-2012-012.pdf http://downloads.asterisk.org/pub/security/AST-2012-012.1.8.diff http://downloads.asterisk.org/pub/security/AST-2012-012.10.diff
Comment 1 Kurt Seifried 2012-08-31 16:00:33 EDT
Created asterisk tracking bugs for this issue Affects: epel-6 [bug 853543]
Comment 2 Kurt Seifried 2012-08-31 16:01:26 EDT
Created asterisk tracking bugs for this issue Affects: fedora-16 [bug 853545]
Comment 3 Kurt Seifried 2012-08-31 16:02:24 EDT
Created asterisk tracking bugs for this issue Affects: fedora-17 [bug 853546]
Comment 4 Fedora Update System 2012-09-17 13:46:40 EDT
asterisk-126.96.36.199-1.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2012-09-17 13:55:37 EDT
asterisk-10.7.1-2.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2012-09-17 19:51:31 EDT
asterisk-10.7.1-2.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2012-09-21 16:52:44 EDT
asterisk-188.8.131.52-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.