I'm forwarding this to bug-guix@gnu.org so that it won't be forgotten.
Mark
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Subject: pjproject package is vulnerable to CVE-2021-21375 and CVE-2020-15260
From: Léo Le Bouter <lle-bout@zaclys.net>
To: guix-devel@gnu.org
Date: Thu, 11 Mar 2021 03:30:42 +0100
CVE-2021-21375 00:15 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 PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service. CVE-2020-15260 00:15 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. Upstream has not made a release yet, I advise we wait for a release on their end then upgrade. To be monitored.
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