chan_iax2.c in the IAX2 channel driver in Certified Asterisk 1.8.11-cert before 1.8.11-cert2 and Asterisk Open Source 1.8.x before 1.8.12.1 and 10.x before 10.4.1, when a certain mohinterpret setting is enabled, allows remote attackers to cause a denial of service (daemon crash) by placing a call on hold.

Several vulnerabilities were discovered in Asterisk, a PBX and telephony toolkit.

  - CVE-2012-2947     The IAX2 channel driver allows remote attackers to cause     a denial of service (daemon crash) by placing a call on     hold (when a certain mohinterpret setting is enabled).

  - CVE-2012-2948     The Skinny channel driver allows remote authenticated     users to cause a denial of service (NULL pointer     dereference and daemon crash) by closing a connection in     off-hook mode.

In addition, it was discovered that Asterisk does not set the alwaysauthreject option by default in the SIP channel driver. This allows remote attackers to observe a difference in response behavior and check for the presence of account names. (CVE-2011-2666 ) System administrators concerned by this user enumerating vulnerability should enable the alwaysauthreject option in the configuration. We do not plan to change the default setting in the stable version (Asterisk 1.6) in order to preserve backwards compatibility.

The remote host is affected by the vulnerability described in GLSA-201206-05 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been found in Asterisk:
      An error in manager.c allows shell access through the MixMonitor         application, GetVar, or Status (CVE-2012-2414).
      An error in chan_skinny.c could cause a heap-based buffer overflow         (CVE-2012-2415).
      An error in chan_sip.c prevents Asterisk from checking if a channel         exists before connected line updates (CVE-2012-2416).
      An error in chan_iax2.c may cause an invalid pointer to be called         (CVE-2012-2947).
      chan_skinny.c contains a NULL pointer dereference (CVE-2012-2948).
  Impact :

    A remote attacker could execute arbitrary code with the privileges of       the process or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The Asterisk Development Team has announced the release of Asterisk 1.8.12.2. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk

The release of Asterisk 1.8.12.2 resolves an issue reported by the community and would have not been possible without your participation.
Thank you!

The following is the issue resolved in this release :

  - --- Resolve crash in subscribing for MWI notifications     (Closes issue ASTERISK-19827. Reported by B. R)

For a full list of changes in this release, please see the ChangeLog :

http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.12.
2

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-cert2, 1.8.12.1, and 10.4.1.

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

The release of Asterisk 1.8.11-cert2, 1.8.12.1, and 10.4.1 resolve the following two issues :

  - A remotely exploitable crash vulnerability exists in the     IAX2 channel driver if an established call is placed on     hold without a suggested music class. Asterisk will     attempt to use an invalid pointer to the music on hold     class name, potentially causing a crash.

  - A remotely exploitable crash vulnerability was found in     the Skinny (SCCP) Channel driver. When an SCCP client     closes its connection to the server, a pointer in a     structure is set to NULL. If the client was not in the     on-hook state at the time the connection was closed,     this pointer is later dereferenced. This allows remote     authenticated connections the ability to cause a crash     in the server, denying services to legitimate users.

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

For more information about the details of these vulnerabilities, please read security advisories AST-2012-007 and AST-2012-008, 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-cert2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.12.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.4.1

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-007.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-00       8.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 attacker to crash the server.  This issue could be exploited when a call is put on hold and the entity placing the call on hold contains the configuration item 'mohinterpret' set to the value 'passthrough'.  An additional requirement is that the call is placed on hold with no 'music-on-hold' class name selected.

he Asterisk Development Team has announced the release of Asterisk 10.4.2. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk

The release of Asterisk 10.4.2 resolves several issues reported by the community and would have not been possible without your participation.
Thank you!

The following are the issues resolved in this release :

  - --- Resolve crash in subscribing for MWI notifications     (Closes issue ASTERISK-19827. Reported by B. R)

  - --- Fix crash in ConfBridge when user announcement is     played for more than 2 users (Closes issue     ASTERISK-19899. Reported by Florian Gilcher)

For a full list of changes in this release, please see the ChangeLog :

http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-10.4.2

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-cert2, 1.8.12.1, and 10.4.1.

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

The release of Asterisk 1.8.11-cert2, 1.8.12.1, and 10.4.1 resolve the following two issues :

  - A remotely exploitable crash vulnerability exists in the     IAX2 channel driver if an established call is placed on     hold without a suggested music class. Asterisk will     attempt to use an invalid pointer to the music on hold     class name, potentially causing a crash.

  - A remotely exploitable crash vulnerability was found in     the Skinny (SCCP) Channel driver. When an SCCP client     closes its connection to the server, a pointer in a     structure is set to NULL. If the client was not in the     on-hook state at the time the connection was closed,     this pointer is later dereferenced. This allows remote     authenticated connections the ability to cause a crash     in the server, denying services to legitimate users.

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

For more information about the details of these vulnerabilities, please read security advisories AST-2012-007 and AST-2012-008, 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-cert2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.12.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.4.1

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-007.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2012-00       8.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.

Asterisk project reports :

Remote crash vulnerability in IAX2 channel driver.

Skinny Channel Driver Remote Crash Vulnerability

ID	Name	Product	Family	Severity
59771	Debian DSA-2493-1 : asterisk - denial of service	Nessus	Debian Local Security Checks	medium
59633	GLSA-201206-05 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
59533	Fedora 16 : asterisk-1.8.12.2-1.fc16 (2012-8692)	Nessus	Fedora Local Security Checks	low
59532	Fedora 15 : asterisk-1.8.12.2-1.fc15 (2012-8685)	Nessus	Fedora Local Security Checks	low
59503	Asterisk Remote Crash Vulnerability in IAX2 Channel Driver (AST-2012-007)	Nessus	Misc.	low
59434	Fedora 17 : asterisk-10.4.2-1.fc17 (2012-8670)	Nessus	Fedora Local Security Checks	low
59302	FreeBSD : asterisk -- multiple vulnerabilities (359f615d-a9e1-11e1-8a66-14dae9ebcf89)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2012-2947

high

Tenable Plugins

medium

medium

low

low

low

low

medium