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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
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.
Source: MITRE View Analysis Description
Source: MITRE
Base Score: 7.5 HIGH Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (V3 legend) Impact Score: 3.6 Exploitability Score: 3.9
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
Base Score: 5.0 MEDIUM Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N) (V2 legend) Impact Subscore: 2.9 Exploitability Subscore: 10.0
Access Vector (AV): Network Access Complexity (AC): Low Authentication (AU): None Confidentiality (C): Partial Integrity (I): None Availability (A): None Additional Information: Allows unauthorized disclosure of information
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Vulnerability Type (View All)
http://www.debian.org/security/2017/dsa-3964 [No Types Assigned]
https://security.gentoo.org/glsa/201710-29 [No Types Assigned]
OR *cpe:2.3:a:digium:asterisk:11.0.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:* *
OR *cpe:2.3:a:digium:asterisk:13.0.0:*:*:*:lts:*:*:* *cpe:2.3:a:digium:asterisk:13.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.0.0:beta2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.0.0:beta3:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.0.1:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.0.2:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.1.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.1.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:13.1.0:rc2:*:*:*:*:*:*
OR *cpe:2.3:a:digium:asterisk:14.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.0:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.0:beta2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.0:rc1:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.0:rc2:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.1:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.0.2:*:*:*:*:*:*:* *cpe:2.3:a:digium:asterisk:14.01:*:*:*:*:*:*:* *cpe:2
OR *cpe:2.3:a:digium:certified_asterisk:11.6:cert1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert10:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert11:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert12:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert13:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:11.6:cert14:*:*:*:*:*:* *cpe:2.3:a:digium:certified_aste
OR *cpe:2.3:a:digium:certified_asterisk:13.13:cert1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert1_rc1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert1_rc2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert1_rc3:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert1_rc4:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:13.13:cert3:*:*:*:*:*:* *cpe:2.3:a:dig
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-200
http://downloads.asterisk.org/pub/security/AST-2017-005.html No Types Assigned
http://downloads.asterisk.org/pub/security/AST-2017-005.html Vendor Advisory
http://www.securitytracker.com/id/1039251 No Types Assigned
http://www.securitytracker.com/id/1039251 Third Party Advisory, VDB Entry
https://bugs.debian.org/873907 No Types Assigned
https://bugs.debian.org/873907 Issue Tracking, Patch, Third Party Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-27013 No Types Assigned
https://issues.asterisk.org/jira/browse/ASTERISK-27013 Issue Tracking, Patch, Third Party Advisory
https://rtpbleed.com No Types Assigned
https://rtpbleed.com Third Party Advisory
http://www.securitytracker.com/id/1039251 [No Types Assigned]