Vulnerability in Pjsip Pjproject
CVE-2020-15260
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In version 2.10 and earlier, PJSIP transport can be reused if they have the same IP address + port + protocol. However, this is insufficient for secure transport since it lacks remote hostname authentication. Suppose we have created a TLS connection to `sip.foo.com`, which has an IP address `100.1.1.1`. If we want to create a TLS connection to another hostname, say `sip.bar.com`, which has the same IP address, then it will reuse that existing connection, even though `100.1.1.1` does not have certificate to authenticate as `sip.bar.com`. The vulnerability allows for an insecure interaction without user awareness. It affects users who need access to connections to different destinations that translate to the same address, and allows man-in-the-middle attack if attacker can route a connection to another destination such as in the case of DNS spoofing.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Pjsip Pjproject — versions <= 2.10
- Teluu Pjsip
Weakness classification (CWE)
References
- github.com/pjsip/pjproject/security/advisories/GHSA-8hcp-hm38-mfph (Patch, Third Party Advisory)
- github.com/pjsip/pjproject/commit/67e46c1ac45ad784db5b9080f5ed8b133c122872 (Patch, Third Party Advisory)
- github.com/pjsip/pjproject/pull/2663 (Patch, Third Party Advisory)
- security.gentoo.org/glsa/202107-42 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15260?
- CVE-2020-15260 is a medium-severity vulnerability in Pjsip Pjproject, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 6.8/10. Published 2021-03-10.
- How severe is CVE-2020-15260?
- Medium severity. CVSS v3 base score is 6.8 out of 10.