Ubuntu: USN-4170-1 Important: PJProject Denial Of Service Vulnerability

Multiple vulnerabilities have been discovered in the PJSIP/PJProject
multimedia communication which may result in denial of service during
the processing of SIP and SDP messages and ioqueue keys.

For the stable distribution (stretch), these problems have been fixed in
version 2.5.5~dfsg-6+deb9u1.

We recommend that you upgrade your pjproject packages.

For the detailed security status of pjproject please refer to
its security tracker page at:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/