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.

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.

The remote host is affected by the vulnerability described in GLSA-202107-42 (PJSIP: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in PJSIP. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

An issue has been found in ring, a secure and distributed voice, video and chat platform. Actually the embedded copy of pjproject is affected by this CVE. Due to bad handling of two consecutive crafted answers to an INVITE, the attacker is able to crash the server resulting in a denial of service.

For Debian 9 stretch, this problem has been fixed in version 20161221.2.7bd7d91~dfsg1-1+deb9u1.

We recommend that you upgrade your ring packages.

For the detailed security status of ring please refer to its security tracker page at: https://security-tracker.debian.org/tracker/ring

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An issue has been found in pjproject, a set of libraries for the PJ Project. Due to bad handling of two consecutive crafted answers to an INVITE, the attacker is able to crash the server resulting in a denial of service.

For Debian 9 stretch, this problem has been fixed in version 2.5.5~dfsg-6+deb9u2.

We recommend that you upgrade your pjproject packages.

For the detailed security status of pjproject please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/pjproject

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
303754	Ubuntu 16.04 LTS / 18.04 LTS : PJSIP vulnerabilities (USN-8122-1)	Nessus	Ubuntu Local Security Checks	critical
157027	GLSA-202107-42 : PJSIP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
149854	Debian DLA-2665-1 : ring security update	Nessus	Debian Local Security Checks	medium
149003	Debian DLA-2636-1 : pjproject security update	Nessus	Debian Local Security Checks	medium

Detections

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CVE-2021-21375

medium

Tenable Plugins

critical

medium

medium

medium