CVE-2018-7285
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.04%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.04% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- digium/asterisk
- Source
- cve@mitre.org
References
- http://downloads.asterisk.org/pub/security/AST-2018-001.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/103149Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040415Third Party Advisory, VDB Entry
- http://downloads.asterisk.org/pub/security/AST-2018-001.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/103149Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040415Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.