chan_skinny.c in the Skinny (aka SCCP) channel driver in Asterisk Open Source 10.x before 10.5.1 allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) by sending a Station Key Pad Button message and closing a connection in off-hook mode, a related issue to CVE-2012-2948.

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 the attacker has a valid SCCP (Skinny) ID and closes a connection when in certain call states. A NULL pointer is left behind and can cause the server to crash when the pointer is later dereferenced.

Note the fix for AST-2012-008 was incomplete.

The Asterisk Development Team has announced a security release for Asterisk 10. This security release is released as version 10.5.1.

The release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases

The release of Asterisk 10.5.1 resolves the following issue :

  - A remotely exploitable crash vulnerability was found in     the Skinny (SCCP) Channel driver. When an SCCP client     sends an Off Hook message, followed by a Key Pad Button     Message, a structure that was previously set to NULL is     dereferenced. This allows remote authenticated     connections the ability to cause a crash in the server,     denying services to legitimate users.

This issue and its resolution is described in the security advisory.

For more information about the details of this vulnerability, please read security advisory AST-2012-009, which was released at the same time as this announcement.

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

http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-10.5.1

The security advisory is available at :

  -     http://downloads.asterisk.org/pub/security/AST-2012-009.
    pdf

The Asterisk Development Team has announced the release of Asterisk 10.5.0. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk

The release of Asterisk 10.5.0 resolves several issues reported by the community and would have not been possible without your participation.
Thank you!

The following is a sample of the issues resolved in this release :

  - --- Turn off warning message when bind address is set to     any. (Closes issue ASTERISK-19456. Reported by Michael     L. Young)

  - --- Prevent overflow in calculation in ast_tvdiff_ms on     32-bit machines (Closes issue ASTERISK-19727. Reported     by Ben Klang)

  - --- Make DAHDISendCallreroutingFacility wait 5 seconds     for a reply before disconnecting the call. (Closes issue     ASTERISK-19708. Reported by mehdi Shirazi)

  - --- Fix recalled party B feature flags for a failed DTMF     atxfer. (Closes issue ASTERISK-19383. Reported by     lgfsantos)

  - --- Fix DTMF atxfer running h exten after the wrong     bridge ends. (Closes issue ASTERISK-19717. Reported by     Mario)

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

http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-10.5.0

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 :

Skinny Channel Driver Remote Crash Vulnerability.

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 may be exploited when the attacker has a valid SCCP (Skinny) ID and closes a connection when in certain call states.  A null pointer is left behind and can cause the server to crash when the pointer is later dereferenced.

ID	Name	Product	Family	Severity
59714	Asterisk Remote Crash Vulnerability in Skinny Channel Driver (AST-2012-009)	Nessus	Misc.	medium
59698	Fedora 17 : asterisk-10.5.1-1.fc17 (2012-9537)	Nessus	Fedora Local Security Checks	medium
59516	FreeBSD : asterisk -- remote crash vulnerability (3c8d1e5b-b673-11e1-be25-14dae9ebcf89)	Nessus	FreeBSD Local Security Checks	medium
6510	Asterisk Remote Crash Vulnerability in Skinny Channel Driver (AST-2012-009)	Nessus Network Monitor	Generic	medium

Detections

Analytics

CVE-2012-3553

medium

Tenable Plugins

medium

medium

medium

medium