UBUNTU-CVE-2021-37706

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UBUNTU-CVE-2021-37706

Summary:

Details: 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 affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.

References: https://ubuntu.com/security/CVE-2021-37706, https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984, https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865, https://ubuntu.com/security/notices/USN-6422-1, https://ubuntu.com/security/notices/USN-6422-2, https://www.cve.org/CVERecord?id=CVE-2021-37706, https://ubuntu.com/security/notices/USN-8122-1