Several vulnerabilities were discovered in Asterisk, a PBX and telephony toolkit, allowing privilege escalation in the Asterisk Manager, denial of service or privilege escalation.

More detailed information can be found in the Asterisk advisories:
AST-2012-010, AST-2012-011, AST-2012-012, and AST-2012-013.

Asterisk project reports :

Asterisk Manager User Unauthorized Shell Access

ACL rules ignored when placing outbound calls by certain IAX2 users

The remote host is affected by the vulnerability described in GLSA-201209-15 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been found in Asterisk:
      An error in manager.c allows shell access (CVE-2012-2186).
      An error in Asterisk could cause all RTP ports to be exhausted         (CVE-2012-3812).
      A double-free error could occur when two parties attempt to         manipulate the same voicemail account simultaneously (CVE-2012-3863).
      Asterisk does not properly implement certain ACL rules         (CVE-2012-4737).
  Impact :

    A remote, authenticated attacker could execute arbitrary code with the       privileges of the process, cause a Denial of Service condition, or bypass       outbound call restrictions.
  Workaround :

    There is no known workaround at this time.

fix build on s390 The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.11 and Asterisk 1.8 and 10. The available security releases are released as versions 1.8.11-cert7, 1.8.15.1, 10.7.1, and 10.7.1-digiumphones.

These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases

The release of Asterisk 1.8.11-cert7, 1.8.15.1, 10.7.1, and 10.7.1-digiumphones resolve the following two issues :

  - A permission escalation vulnerability in Asterisk     Manager Interface. This would potentially allow remote     authenticated users the ability to execute commands on     the system shell with the privileges of the user running     the Asterisk application. Please note that the     README-SERIOUSLY.bestpractices.txt file delivered with     Asterisk has been updated due to this and other related     vulnerabilities fixed in previous versions of Asterisk.

  - When an IAX2 call is made using the credentials of a     peer defined in a dynamic Asterisk Realtime Architecture     (ARA) backend, the ACL rules for that peer are not     applied to the call attempt. This allows for a remote     attacker who is aware of a peer's credentials to bypass     the ACL rules set for that peer.

These issues and their resolutions are described in the security advisories.

For more information about the details of these vulnerabilities, please read security advisories AST-2012-012 and AST-2012-013, which were released at the same time as this announcement.

For a full list of changes in the current releases, please see the ChangeLogs :

http://downloads.asterisk.org/pub/telephony/certified-asterisk/release s/ChangeLog-1.8.11-cert7 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.15.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.7.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.7.1-digiumphones

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-012.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-01       3.pdf

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.11 and Asterisk 1.8 and 10. The available security releases are released as versions 1.8.11-cert7, 1.8.15.1, 10.7.1, and 10.7.1-digiumphones.

These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases

The release of Asterisk 1.8.11-cert7, 1.8.15.1, 10.7.1, and 10.7.1-digiumphones resolve the following two issues :

  - A permission escalation vulnerability in Asterisk     Manager Interface. This would potentially allow remote     authenticated users the ability to execute commands on     the system shell with the privileges of the user running     the Asterisk application. Please note that the     README-SERIOUSLY.bestpractices.txt file delivered with     Asterisk has been updated due to this and other related     vulnerabilities fixed in previous versions of Asterisk.

  - When an IAX2 call is made using the credentials of a     peer defined in a dynamic Asterisk Realtime Architecture     (ARA) backend, the ACL rules for that peer are not     applied to the call attempt. This allows for a remote     attacker who is aware of a peer's credentials to bypass     the ACL rules set for that peer.

These issues and their resolutions are described in the security advisories.

For more information about the details of these vulnerabilities, please read security advisories AST-2012-012 and AST-2012-013, which were released at the same time as this announcement.

For a full list of changes in the current releases, please see the ChangeLogs :

http://downloads.asterisk.org/pub/telephony/certified-asterisk/release s/ChangeLog-1.8.11-cert7 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.15.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.7.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.7.1-digiumphones

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-012.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-01       3.pdf

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a vulnerability that could allow a remote, authenticated attacker to bypass access controls, execute shell commands and escalate privileges.

Applications and functions that require 'system' class authorization are contained in a predefined list, which allows or denies certain actions.
The combination of the 'ExternalIVR' application and the 'Originate' action is not in the predefined list and can be used to execute unauthorized shell commands on the host.

ID	Name	Product	Family	Published	Updated	Severity
62188	Debian DSA-2550-2 : asterisk - several vulnerabilities	Nessus	Debian Local Security Checks	9/19/2012	1/11/2021	high
61742	FreeBSD : asterisk -- multiple vulnerabilities (4c53f007-f2ed-11e1-a215-14dae9ebcf89)	Nessus	FreeBSD Local Security Checks	8/31/2012	1/6/2021	high
62344	GLSA-201209-15 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	9/27/2012	1/6/2021	high
62149	Fedora 17 : asterisk-10.7.1-2.fc17 (2012-13338)	Nessus	Fedora Local Security Checks	9/18/2012	1/11/2021	high
62154	Fedora 16 : asterisk-1.8.15.1-1.fc16 (2012-13437)	Nessus	Fedora Local Security Checks	9/18/2012	1/11/2021	high
61993	Asterisk Manager Interface ExternalIVR Application Originate Action Remote Shell Command Execution (AST-2012-012)	Nessus	Misc.	9/6/2012	4/11/2022	high
62148	Fedora 18 : asterisk-10.7.1-2.fc18 (2012-13286)	Nessus	Fedora Local Security Checks	9/18/2012	1/11/2021	high

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