An issue was discovered in Teluu pjproject (pjlib and pjlib-util) in PJSIP before 2.7.1. The ioqueue component may issue a double key unregistration after an attacker initiates a socket connection with specific settings and sequences. Such double key unregistration will trigger an integer overflow, which may cause ioqueue backends to reject future key registrations.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8122-1 advisory.

    Youngsung Kim discovered that PJSIP did not properly parse numeric header fields in SIP messages. A remote     attacker could use this issue to cause PJSIP to crash, resulting in a denial of service, or possibly     execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-16872)

    Peter Koletzki discovered that PJSIP did not properly handle certain connection requests. A remote     attacker could possibly use this issue to cause PJSIP to enter an unrecoverable state and reject further     connections, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-16875)

    Alfred Farrugia, Sandro Gauci, and Kevin Harwell discovered that PJSIP did not properly parse certain SDP     messages. A remote attacker could possibly use this issue to cause PJSIP to crash, resulting in a denial     of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-1000098, CVE-2018-1000099)

    Lauri Vnsk discovered that PJSIP did not verify hostnames when reusing TLS connections. If a remote     attacker were able to intercept communication, this flaw could possibly be exploited to view sensitive     information. (CVE-2020-15260)

    It was discovered that PJSIP did not properly handle certain sequences of SDP messages. A remote attacker     could possibly use this issue to cause PJSIP to crash, resulting in a denial of service. (CVE-2021-21375)

    It was discovered that the SSL socket implementation in PJSIP contained a race condition. A remote     attacker could possibly use this issue to cause PJSIP to crash, resulting in a denial of service. This     issue was only addressed in Ubuntu 18.04 LTS. (CVE-2021-32686)

    It was discovered that PJSIP did not properly parse certain STUN messages. A remote attacker could use     this issue to cause PJSIP to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2021-37706)

    Uriya Yavnieli discovered that PJSIP did not properly manage memory under certain conditions. A remote     attacker could use this issue to cause PJSIP to crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2021-43299, CVE-2021-43300, CVE-2021-43301, CVE-2021-43302, CVE-2021-43303)

    It was discovered that PJSIP did not properly manage memory when processing ICE session credentials. A     remote attacker could use this issue to cause PJSIP to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2026-25994)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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.

ID	Name	Product	Family	Type	Severity
303754	Ubuntu 16.04 LTS / 18.04 LTS : PJSIP vulnerabilities (USN-8122-1)	Nessus	Ubuntu Local Security Checks	Local	critical
108906	Debian DSA-4170-1 : pjproject - security update	Nessus	Debian Local Security Checks	Local	critical

Detections

Analytics

CVE-2017-16875

high

Tenable Plugins

critical

critical