According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a denial of service vulnerability. A flaw exists in the handling of TCP and TLS connections when the connection is initiated but not completed. A remote attacker could repeatedly send such requests that may result in a denial of service.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Multiple vulnerabilities has been discovered and corrected in asterisk :

Asterisk Open Source 11.x before 11.10.1 and 12.x before 12.3.1 and Certified Asterisk 11.6 before 11.6-cert3 allows remote authenticated Manager users to execute arbitrary shell commands via a MixMonitor action (CVE-2014-4046).

Asterisk Open Source 1.8.x before 1.8.28.1, 11.x before 11.10.1, and 12.x before 12.3.1 and Certified Asterisk 1.8.15 before 1.8.15-cert6 and 11.6 before 11.6-cert3 allows remote attackers to cause a denial of service (connection consumption) via a large number of (1) inactive or (2) incomplete HTTP connections (CVE-2014-4047).

The updated packages has been upgraded to the 11.11.0 version which is not vulnerable to these issues.

The remote host is affected by the vulnerability described in GLSA-201406-25 (Asterisk: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review       the CVE identifiers below for details.
  Impact :

    A remote attacker that gains access to a privileged Asterisk account can       execute arbitrary system shell commands. Furthermore an unprivileged       remote attacker could cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The Asterisk project reports :

Asterisk Manager User Unauthorized Shell Access. Manager users can execute arbitrary shell commands with the MixMonitor manager action.
Asterisk does not require system class authorization for a manager user to use the MixMonitor action, so any manager user who is permitted to use manager commands can potentially execute shell commands as the user executing the Asterisk process.

Exhaustion of Allowed Concurrent HTTP Connections. Establishing a TCP or TLS connection to the configured HTTP or HTTPS port respectively in http.conf and then not sending or completing a HTTP request will tie up a HTTP session. By doing this repeatedly until the maximum number of open HTTP sessions is reached, legitimate requests are blocked.

The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.15, 11.6, and Asterisk 1.8, 11, and 12. The available security releases are released as versions 1.8.15-cert7, 11.6-cert4, 1.8.28.2, 11.10.2, and 12.3.2.

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

These releases resolve security vulnerabilities that were previously fixed in 1.8.15-cert6, 11.6-cert3, 1.8.28.1, 11.10.1, and 12.3.1.
Unfortunately, the fix for AST-2014-007 inadvertently introduced a regression in Asterisk's TCP and TLS handling that prevented Asterisk from sending data over these transports. This regression and the security vulnerabilities have been fixed in the versions specified in this release announcement.

The security patches for AST-2014-007 have been updated with the fix for the regression, and are available at http://downloads.asterisk.org/pub/security

Please note that the release of these versions resolves the following security vulnerabilities :

  - AST-2014-005: Remote Crash in PJSIP Channel Driver's     Publish/Subscribe Framework

  - AST-2014-006: Permission Escalation via Asterisk Manager     User Unauthorized Shell Access

  - AST-2014-007: Denial of Service via Exhaustion of     Allowed Concurrent HTTP Connections

  - AST-2014-008: Denial of Service in PJSIP Channel Driver     Subscriptions

For more information about the details of these vulnerabilities, please read security advisories AST-2014-005, AST-2014-006, AST-2014-007, and AST-2014-008, which were released with the previous versions that addressed these vulnerabilities.

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-1.8.15-cert7 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.28.2 http://downloads.asterisk.org/pub/telephony/certified-asterisk/release s/ChangeLog-11.6-cert4 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-11.10.2 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-12.3.2

The security advisories are available at :

  -     http://downloads.asterisk.org/pub/security/AST-2014-005.
    pdf

    -       http://downloads.asterisk.org/pub/security/AST-2014-00       6.pdf

    -       http://downloads.asterisk.org/pub/security/AST-2014-00       7.pdf

    -       http://downloads.asterisk.org/pub/security/AST-2014-00       8.pdf

The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.15, 11.6, and Asterisk 1.8, 11, and 12. The available security releases are released as versions 1.8.15-cert6, 11.6-cert3, 1.8.28.1, 11.10.1, and 12.3.1.

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

The release of these versions resolves the following issue :

  - AST-2014-007: Denial of Service via Exhaustion of     Allowed Concurrent HTTP Connections

    Establishing a TCP or TLS connection to the configured     HTTP or HTTPS port respectively in http.conf and then     not sending or completing a HTTP request will tie up a     HTTP session. By doing this repeatedly until the maximum     number of open HTTP sessions is reached, legitimate     requests are blocked.

Additionally, the release of 11.6-cert3, 11.10.1, and 12.3.1 resolves the following issue :

  - AST-2014-006: Permission Escalation via Asterisk Manager     User Unauthorized Shell Access

    Manager users can execute arbitrary shell commands with     the MixMonitor manager action. Asterisk does not require     system class authorization for a manager user to use the     MixMonitor action, so any manager user who is permitted     to use manager commands can potentially execute shell     commands as the user executing the Asterisk process.

Additionally, the release of 12.3.1 resolves the following issues :

  - AST-2014-005: Remote Crash in PJSIP Channel Driver's     Publish/Subscribe Framework

    A remotely exploitable crash vulnerability exists in the     PJSIP channel driver's pub/sub framework. If an attempt     is made to unsubscribe when not currently subscribed and     the endpoint's 'sub_min_expiry' is set to zero,     Asterisk tries to create an expiration timer with zero     seconds, which is not allowed, so an assertion raised.

  - AST-2014-008: Denial of Service in PJSIP Channel Driver     Subscriptions

    When a SIP transaction timeout caused a subscription to     be terminated, the action taken by Asterisk was     guaranteed to deadlock the thread on which SIP requests     are serviced. Note that this behavior could only happen     on established subscriptions, meaning that this could     only be exploited if an attacker bypassed authentication     and successfully subscribed to a real resource on the     Asterisk server.

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-2014-005, AST-2014-006, AST-2014-007, and AST-2014-008, 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-1.8.15-cert6 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-1.8.28.1 http://downloads.asterisk.org/pub/telephony/certified-asterisk/release s/ChangeLog-11.6-cert3 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-11.10.1 http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLo g-12.3.1

The Asterisk Development Team has announced the release of Asterisk 11.10.0. This release is available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk

The release of Asterisk 11.10.0 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 :

Bugs fixed in this release :

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.

ID	Name	Product	Family	Published	Updated	Severity
76088	Asterisk HTTP Session Handling DoS (AST-2014-007)	Nessus	Misc.	6/17/2014	4/11/2022	medium
76482	Mandriva Linux Security Advisory : asterisk (MDVSA-2014:138)	Nessus	Mandriva Local Security Checks	7/13/2014	1/6/2021	medium
76227	GLSA-201406-25 : Asterisk: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	6/26/2014	1/6/2021	medium
76103	FreeBSD : asterisk -- multiple vulnerabilities (f109b02f-f5a4-11e3-82e9-00a098b18457)	Nessus	FreeBSD Local Security Checks	6/18/2014	1/6/2021	medium
77769	Fedora 19 : asterisk-11.10.2-2.fc19 (2014-7570)	Nessus	Fedora Local Security Checks	9/22/2014	1/11/2021	medium
77768	Fedora 20 : asterisk-11.10.2-2.fc20 (2014-7551)	Nessus	Fedora Local Security Checks	9/22/2014	1/11/2021	medium

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