CVE-2018-7285 Detail
Current Description
A NULL pointer access issue was discovered in Asterisk 15.x through 15.2.1. The RTP support in Asterisk maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may result in a codec using a different payload number, these desired ones are still stored internally. When an RTP packet was received, this registry would be consulted if the payload number was not found in the negotiated SDP. This registry was incorrectly consulted for all packets, even those which are dynamic. If the payload number resulted in a codec of a different type than the RTP stream (for example, the payload number resulted in a video codec but the stream carried audio), a crash could occur if no stream of that type had been negotiated. This was due to the code incorrectly assuming that a stream of that type would always exist.
Source:
MITRE
View Analysis Description
Analysis Description
A NULL pointer access issue was discovered in Asterisk 15.x through 15.2.1. The RTP support in Asterisk maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may result in a codec using a different payload number, these desired ones are still stored internally. When an RTP packet was received, this registry would be consulted if the payload number was not found in the negotiated SDP. This registry was incorrectly consulted for all packets, even those which are dynamic. If the payload number resulted in a codec of a different type than the RTP stream (for example, the payload number resulted in a video codec but the stream carried audio), a crash could occur if no stream of that type had been negotiated. This was due to the code incorrectly assuming that a stream of that type would always exist.
Source:
MITRE
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
7.5 HIGH
Vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
(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):
None
Integrity (I):
None
Availability (A):
High
CVSS v2.0 Severity and Metrics:
Base Score:
5.0 MEDIUM
Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
(V2 legend)
Impact Subscore:
2.9
Exploitability Subscore:
10.0
Access Vector (AV):
Network
Access Complexity (AC):
Insufficient_Info
Authentication (AU):
None
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
Partial
Additional Information:
Allows disruption of service
References to Advisories, Solutions, and Tools
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Change History
4 change records found
- show changes
Initial Analysis -
3/21/2018 8:56:56 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 15.0.0 up to (including) 15.2.1 |
| Added |
CVSS V2 |
|
(AV:N/AC:L/Au:N/C:N/I:N/A:P) |
| Added |
CVSS V3 |
|
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Added |
CWE |
|
CWE-476 |
| Changed |
Reference Type |
http://downloads.asterisk.org/pub/security/AST-2018-001.html No Types Assigned |
http://downloads.asterisk.org/pub/security/AST-2018-001.html Patch, Vendor Advisory |
| Changed |
Reference Type |
http://www.securityfocus.com/bid/103149 No Types Assigned |
http://www.securityfocus.com/bid/103149 Third Party Advisory, VDB Entry |
| Changed |
Reference Type |
http://www.securitytracker.com/id/1040415 No Types Assigned |
http://www.securitytracker.com/id/1040415 Third Party Advisory, VDB Entry |
CVE Modified by MITRE -
2/27/2018 9:29:06 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
http://www.securityfocus.com/bid/103149 [No Types Assigned] |
CVE Modified by MITRE -
2/23/2018 9:29:06 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
http://www.securitytracker.com/id/1040415 [No Types Assigned] |
CVE Modified by MITRE -
2/21/2018 9:29:01 PM
| Action |
Type |
Old Value |
New Value |
| Changed |
Description |
Record truncated, showing 500 of 845 characters.
View Entire Change Record
A NULL pointer access issue was discovered in Asterisk through 15.2.1. The RTP support in Asterisk maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may result in a codec using a different payload number, these desired ones are still stored internally. When an RTP packet was received, this registry would be consulted if the payload number was not found in the negotiated SDP. This registry was incorrectly consulted for all packets, even those which |
Record truncated, showing 500 of 850 characters.
View Entire Change Record
A NULL pointer access issue was discovered in Asterisk 15.x through 15.2.1. The RTP support in Asterisk maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may result in a codec using a different payload number, these desired ones are still stored internally. When an RTP packet was received, this registry would be consulted if the payload number was not found in the negotiated SDP. This registry was incorrectly consulted for all packets, even those |
Quick Info
CVE Dictionary Entry:
CVE-2018-7285
NVD Published Date:
02/21/2018
NVD Last Modified:
03/21/2018
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