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CVE-2017-14099

Status Candidate

Overview

In res/res_rtp_asterisk.c in Asterisk 11.x before 11.25.2, 13.x before 13.17.1, and 14.x before 14.6.1 and Certified Asterisk 11.x before 11.6-cert17 and 13.x before 13.13-cert5, unauthorized data disclosure (media takeover in the RTP stack) is possible with careful timing by an attacker. The "strictrtp" option in rtp.conf enables a feature of the RTP stack that learns the source address of media for a session and drops any packets that do not originate from the expected address. This option is enabled by default in Asterisk 11 and above. The "nat" and "rtp_symmetric" options (for chan_sip and chan_pjsip, respectively) enable symmetric RTP support in the RTP stack. This uses the source address of incoming media as the target address of any sent media. This option is not enabled by default, but is commonly enabled to handle devices behind NAT. A change was made to the strict RTP support in the RTP stack to better tolerate late media when a reinvite occurs. When combined with the symmetric RTP support, this introduced an avenue where media could be hijacked. Instead of only learning a new address when expected, the new code allowed a new source address to be learned at all times. If a flood of RTP traffic was received, the strict RTP support would allow the new address to provide media, and (with symmetric RTP enabled) outgoing traffic would be sent to this new address, allowing the media to be hijacked. Provided the attacker continued to send traffic, they would continue to receive traffic as well.

Related Files

Gentoo Linux Security Advisory 201710-29
Posted Oct 29, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201710-29 - Multiple vulnerabilities have been found in Asterisk, the worst of which allows remote execution of arbitrary shell commands. Versions less than 11.25.3 are affected.

tags | advisory, remote, arbitrary, shell, vulnerability
systems | linux, gentoo
advisories | CVE-2017-14098, CVE-2017-14099, CVE-2017-14100, CVE-2017-14603
MD5 | dc6664f1f4febce3a1ec19be4fbf4607
Asterisk Project Security Advisory - AST-2017-008
Posted Sep 20, 2017
Authored by Klaus-Peter Junghanns | Site asterisk.org

Asterisk Project Security Advisory - Insufficient RTCP packet validation could allow reading stale buffer contents and when combined with the nat and symmetric_rtp options allow redirecting where Asterisk sends the next RTCP report.

tags | advisory
advisories | CVE-2017-14099
MD5 | d059f1a85e6d55a3c38cf209cf91c0ce
Asterisk 14.6.1 RTP Bleed
Posted Sep 2, 2017
Authored by Sandro Gauci, Klaus-Peter Junghanns

Asterisk versions 11.4.0 through 14.6.1 suffer from an RTP man-in-the-middle vulnerability.

tags | advisory
advisories | CVE-2017-14099
MD5 | c91e9a9784eb79d8de4896c824e15a8b
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