[asterisk-users] Asterisk 1.8.28-cert3,, 11.6-cert8, 11.14.1, 12.7.1, 13.0.1 Now Available (Security Release)

Asterisk Development Team asteriskteam at digium.com
Thu Nov 20 18:12:00 CST 2014

The Asterisk Development Team has announced security releases for Certified
Asterisk 1.8.28 and 11.6 and Asterisk 1.8, 11, 12, and 13. The available
security releases are released as versions 1.8.28-cert3, 11.6-cert8,,
11.14.1, 12.7.1, and 13.0.1.

These releases are available for immediate download at

The release of these versions resolves the following security vulnerabilities:

* AST-2014-012: Unauthorized access in the presence of ACLs with mixed IP
  address families

  Many modules in Asterisk that service incoming IP traffic have ACL options
  ("permit" and "deny") that can be used to whitelist or blacklist address
  ranges. A bug has been discovered where the address family of incoming
  packets is only compared to the IP address family of the first entry in the
  list of access control rules. If the source IP address for an incoming
  packet is not of the same address as the first ACL entry, that packet
  bypasses all ACL rules.

* AST-2014-018: Permission Escalation through DB dialplan function

  The DB dialplan function when executed from an external protocol, such as AMI,
  could result in a privilege escalation. Users with a lower class authorization
  in AMI can access the internal Asterisk database without the required SYSTEM
  class authorization.

In addition, the release of 11.6-cert8 and 11.14.1 resolves the following
security vulnerability:

* AST-2014-014: High call load with ConfBridge can result in resource exhaustion

  The ConfBridge application uses an internal bridging API to implement
  conference bridges. This internal API uses a state model for channels within
  the conference bridge and transitions between states as different things
  occur. Unload load it is possible for some state transitions to be delayed
  causing the channel to transition from being hung up to waiting for media. As
  the channel has been hung up remotely no further media will arrive and the
  channel will stay within ConfBridge indefinitely.

In addition, the release of 11.6-cert8, 11.14.1, 12.7.1, and 13.0.1 resolves
the following security vulnerability:

* AST-2014-017: Permission Escalation via ConfBridge dialplan function and
                AMI ConfbridgeStartRecord Action

  The CONFBRIDGE dialplan function when executed from an external protocol (such
  as AMI) can result in a privilege escalation as certain options within that
  function can affect the underlying system. Additionally, the AMI
  ConfbridgeStartRecord action has options that would allow modification of the
  underlying system, and does not require SYSTEM class authorization in AMI.

Finally, the release of 12.7.1 and 13.0.1 resolves the following security

* AST-2014-013: Unauthorized access in the presence of ACLs in the PJSIP stack

  The Asterisk module res_pjsip provides the ability to configure ACLs that may
  be used to reject SIP requests from various hosts. However, the module
  currently fails to create and apply the ACLs defined in its configuration
  file on initial module load.

* AST-2014-015: Remote crash vulnerability in PJSIP channel driver

  The chan_pjsip channel driver uses a queue approach for relating to SIP
  sessions. There exists a race condition where actions may be queued to answer
  a session or send ringing after a SIP session has been terminated using a
  CANCEL request. The code will incorrectly assume that the SIP session is still
  active and attempt to send the SIP response. The PJSIP library does not
  expect the SIP session to be in the disconnected state when sending the
  response and asserts.

* AST-2014-016: Remote crash vulnerability in PJSIP channel driver

  When handling an INVITE with Replaces message the res_pjsip_refer module
  incorrectly assumes that it will be operating on a channel that has just been
  created. If the INVITE with Replaces message is sent in-dialog after a session
  has been established this assumption will be incorrect. The res_pjsip_refer
  module will then hang up a channel that is actually owned by another thread.
  When this other thread attempts to use the just hung up channel it will end up
  using a freed channel which will likely result in a crash.

For more information about the details of these vulnerabilities, please read
security advisories AST-2014-012, AST-2014-013, AST-2014-014, AST-2014-015,
AST-2014-016, AST-2014-017, and AST-2014-018, which were released at the same
time as this announcement.

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


The security advisories are available at:

 * http://downloads.asterisk.org/pub/security/AST-2014-012.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-013.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-014.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-015.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-016.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-017.pdf
 * http://downloads.asterisk.org/pub/security/AST-2014-018.pdf

Thank you for your continued support of Asterisk!

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