CVE-2020-15260 Information

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 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

Reference

https://github.com/pjsip/pjproject/commit/67e46c1ac45ad784db5b9080f5ed8b133c122872 https://github.com/pjsip/pjproject/pull/2663 https://github.com/pjsip/pjproject/security/advisories/GHSA-8hcp-hm38-mfph https://security.gentoo.org/glsa/202107-42

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.8