Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2017-14099

Disclosure Date: September 02, 2017 •
CVE-2017-14099 CVSS v3 Base Score: 7.5
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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CVSS V3 Severity and Metrics
Base Score:
7.5 High
Impact Score:
3.6
Exploitability Score:
3.9
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
None
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • digium

Products

  • asterisk 11.0.0,
  • asterisk 11.0.1,
  • asterisk 11.0.2,
  • asterisk 11.1.0,
  • asterisk 11.1.1,
  • asterisk 11.1.2,
  • asterisk 11.10.0,
  • asterisk 11.10.1,
  • asterisk 11.10.2,
  • asterisk 11.11.0,
  • asterisk 11.12.0,
  • asterisk 11.12.1,
  • asterisk 11.13.0,
  • asterisk 11.13.1,
  • asterisk 11.14.0,
  • asterisk 11.14.1,
  • asterisk 11.14.2,
  • asterisk 11.15.0,
  • asterisk 11.15.1,
  • asterisk 11.16.0,
  • asterisk 11.17.0,
  • asterisk 11.17.1,
  • asterisk 11.18.0,
  • asterisk 11.19.0,
  • asterisk 11.2.0,
  • asterisk 11.2.1,
  • asterisk 11.2.2,
  • asterisk 11.20.0,
  • asterisk 11.21.0,
  • asterisk 11.21.1,
  • asterisk 11.21.2,
  • asterisk 11.22.0,
  • asterisk 11.23.0,
  • asterisk 11.23.1,
  • asterisk 11.24.0,
  • asterisk 11.24.1,
  • asterisk 11.25.0,
  • asterisk 11.25.1,
  • asterisk 11.4.0,
  • asterisk 11.6.0,
  • asterisk 11.6.1,
  • asterisk 11.7.0,
  • asterisk 11.8.0,
  • asterisk 11.8.1,
  • asterisk 11.9.0,
  • asterisk 13.0.0,
  • asterisk 13.0.1,
  • asterisk 13.0.2,
  • asterisk 13.1.0,
  • asterisk 13.1.1,
  • asterisk 13.10.0,
  • asterisk 13.11.0,
  • asterisk 13.11.1,
  • asterisk 13.11.2,
  • asterisk 13.12,
  • asterisk 13.12.0,
  • asterisk 13.12.1,
  • asterisk 13.12.2,
  • asterisk 13.13,
  • asterisk 13.13.0,
  • asterisk 13.13.1,
  • asterisk 13.14.0,
  • asterisk 13.14.1,
  • asterisk 13.15.0,
  • asterisk 13.15.1,
  • asterisk 13.16.0,
  • asterisk 13.17.0,
  • asterisk 13.2.0,
  • asterisk 13.2.1,
  • asterisk 13.3.0,
  • asterisk 13.3.2,
  • asterisk 13.4.0,
  • asterisk 13.5.0,
  • asterisk 13.6.0,
  • asterisk 13.7.0,
  • asterisk 13.7.1,
  • asterisk 13.7.2,
  • asterisk 13.8.0,
  • asterisk 13.8.1,
  • asterisk 13.8.2,
  • asterisk 13.9.0,
  • asterisk 13.9.1,
  • asterisk 14.0,
  • asterisk 14.0.0,
  • asterisk 14.0.1,
  • asterisk 14.0.2,
  • asterisk 14.01,
  • asterisk 14.02,
  • asterisk 14.1,
  • asterisk 14.1.0,
  • asterisk 14.1.1,
  • asterisk 14.1.2,
  • asterisk 14.2,
  • asterisk 14.2.0,
  • asterisk 14.2.1,
  • asterisk 14.3.0,
  • asterisk 14.3.1,
  • asterisk 14.4.0,
  • asterisk 14.4.1,
  • asterisk 14.5.0,
  • asterisk 14.6.0,
  • certified asterisk 11.6,
  • certified asterisk 13.13
Technical Analysis