> Asterisk Project Security Advisory - ASA-2007-013 > > +----------------------------------------------------------------------------------+ > | Product | Asterisk | > |----------------------+-----------------------------------------------------------| > | Summary | IAX2 users can cause unauthorized data disclosure | > |----------------------+-----------------------------------------------------------| > | Nature of Advisory | Unauthorized information disclosure | > |----------------------+-----------------------------------------------------------| > | Susceptibility | Remote authenticated sessions | > |----------------------+-----------------------------------------------------------| > | Severity | Low | > |----------------------+-----------------------------------------------------------| > | Exploits Known | No | > |----------------------+-----------------------------------------------------------| > | Reported On | April 27, 2007 | > |----------------------+-----------------------------------------------------------| > | Reported By | Tim Panton, Mexuar, <tim@xxxxxxxxxx> | > | | | > | | Birgit Arkesteijn, Westhawk, <birgit@xxxxxxxxxxxxxx> | > |----------------------+-----------------------------------------------------------| > | Posted On | May 4, 2007 | > |----------------------+-----------------------------------------------------------| > | Last Updated On | May 4, 2007 | > |----------------------+-----------------------------------------------------------| > | Advisory Contact | kpfleming@xxxxxxxxxx | > |----------------------+-----------------------------------------------------------| > | CVE Name | CVE-2007-2488 | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Description | > From: Tim Panton <tim@xxxxxxxxxx> | > | | | > | | > Date: 27 April 2007 08:02:36 BDT | > | | | > | | > To: "Kevin P. Fleming" <kpfleming@xxxxxxxxxx> | > | | | > | | > Subject: Possible IAX2 vulnerability (Minor) | > | | | > | | > | > | | | > | | > We've stumbled on a bug in the way Asterisk's IAX2 handles text | > | | | > | | > frames. | > | | | > | | > I'm emailing you because it is a borderline security | > | | vulnerability, | > | | | > | | > and my | > | | | > | | > friends in the security world tell me that I should notify the | > | | | > | | > vendor privately | > | | | > | | > first. If you feel it isn't a security issue, let me know and | > | | I'll | > | | | > | | > put it in mantis. | > | | | > | | > | > | | | > | | > chan_iax2 assumes that the content of a text frame is a null | > | | | > | | > terminated | > | | | > | | > string (C style), and when time comes to forward the string it | > | | uses | > | | | > | | > strlen | > | | | > | | > to determine the message length. | > | | | > | | > | > | | | > | | > If you send a frame without a 0 byte in it, Asterisk forwards a | > | | | > | | > frame that | > | | | > | | > includes the sent data and some extra (presumably heap) data. | > | | | > | | > | > | | | > | | > If an attacker were lucky, the extra data could contain | > | | something | > | | | > | | > interesting. | > | | | > | | > Or conceivably it could cause a segmentation violation. | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Resolution | Asterisk code has been modified to enforce null-termination of | > | | incoming text frames received by the IAX2 channel driver | > | | (chan_iax2). When text frames are received without | > | | null-termination, this may result in the last byte of data in the | > | | frame being lost, if the IAX2 reception process does not have space | > | | in its receive buffer to add a null character. | > | | | > | | As this vulnerability is of 'low' severity, it does not justify new | > | | releases of Asterisk solely for mitigating its impact. The fix for | > | | this vulnerability has been committed to the Asterisk Subversion | > | | source code repositories and is available to all users who wish to | > | | upgrade to a prerelease checkout of the respective development | > | | branch for their release series of Asterisk. All other users can | > | | upgrade when the next regularly scheduled release of their product | > | | is produced. | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Affected Versions | > |----------------------------------------------------------------------------------| > | Product | Release | | > | | Series | | > |----------------------------------+-------------+---------------------------------| > | Asterisk Open Source | 1.0.x | has not been evaluated as this | > | | | release series is no longer | > | | | maintained | > |----------------------------------+-------------+---------------------------------| > | Asterisk Open Source | 1.2.x | all releases prior to 1.2.19 | > |----------------------------------+-------------+---------------------------------| > | Asterisk Open Source | 1.4.x | all releases prior to 1.4.4 | > |----------------------------------+-------------+---------------------------------| > | Asterisk Business Edition | A.x.x | all releases | > |----------------------------------+-------------+---------------------------------| > | Asterisk Business Edition | B.x.x | all releases prior to B.2.1 | > |----------------------------------+-------------+---------------------------------| > | AsteriskNOW | pre-release | all releases prior to and | > | | | including Beta 5 | > |----------------------------------+-------------+---------------------------------| > | Asterisk Appliance Developer Kit | 0.x.x | all releases prior to 0.4.1 | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Corrected In | > |----------------------------------------------------------------------------------| > | Product | Release | > |----------------------+-----------------------------------------------------------| > | Asterisk Open Source | 1.2.19 and 1.4.4 will be available from | > | | ftp://ftp.digium.com/pub/telephony/asterisk when released | > |----------------------+-----------------------------------------------------------| > | Asterisk Business | B.2.1, will be available from the Asterisk Business | > | Edition | Edition user portal on http://www.digium.com or via | > | | Digium Technical Support when released | > |----------------------+-----------------------------------------------------------| > | AsteriskNOW | Beta 6, when available from http://www.asterisknow.org, | > | | Beta 5 users can use 'System Update' in the appliance | > | | control panel to update their version of AsteriskNOW when | > | | Asterisk 1.4.4 has been released | > |----------------------+-----------------------------------------------------------| > | Asterisk Appliance | 0.4.1, will be available from | > | Developer Kit | ftp://ftp.digium.com/pub/telephony/aadk when released | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Links | http://bugs.digium.com/view.php?id=9638 | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Asterisk Project Security Advisories are posted at | > | http://www.asterisk.org/security. | > | | > | This document may be superseded by later versions; if so, the latest version | > | will be posted at http://ftp.digium.com/pub/asa/ASA-2007-013.pdf. | > +----------------------------------------------------------------------------------+ > > +----------------------------------------------------------------------------------+ > | Revision History | > |----------------------------------------------------------------------------------| > | Date | Editor | Revisions Made | > |-------------------+-----------------------------+--------------------------------| > | May 4, 2007 | kpfleming@xxxxxxxxxx | initial release | > +----------------------------------------------------------------------------------+ > > Asterisk Project Security Advisory - ASA-2007-013 > Copyright (c) 2007 Digium, Inc. All Rights Reserved. > Permission is hereby granted to distribute and publish this advisory in its original, > unaltered form.
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