CVE-2020-15260

Vulnerability Description

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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/pjsip/pjproject/commit/67e46c1ac45ad784db5b9080f5ed8b133c1228PatchThird Party Advisory
• https://github.com/pjsip/pjproject/pull/2663PatchThird Party Advisory
• https://github.com/pjsip/pjproject/security/advisories/GHSA-8hcp-hm38-mfphPatchThird Party Advisory
• https://security.gentoo.org/glsa/202107-42Third Party Advisory
• https://github.com/pjsip/pjproject/commit/67e46c1ac45ad784db5b9080f5ed8b133c1228PatchThird Party Advisory
• https://github.com/pjsip/pjproject/pull/2663PatchThird Party Advisory
• https://github.com/pjsip/pjproject/security/advisories/GHSA-8hcp-hm38-mfphPatchThird Party Advisory
• https://security.gentoo.org/glsa/202107-42Third Party Advisory