NULL pointer dereference in Digium Asterisk
CVE-2018-7285
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.050 (92.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.050 · newest: 0.050 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.securitytracker.com/id/1040415 (VDB Entry, Third Party Advisory, vdb-entry)
- www.securityfocus.com/bid/103149 (VDB Entry, Third Party Advisory, vdb-entry)
- downloads.asterisk.org/pub/security/AST-2018-001.html (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-7285?
- CVE-2018-7285 is a high-severity vulnerability in Digium Asterisk, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-02-22.
- How severe is CVE-2018-7285?
- High severity. CVSS v3 base score is 7.5 out of 10.