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.

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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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.
    (CVE-2020-15260)

  - 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-2021-21375)

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.

ID	Name	Product	Family	Severity
303754	Ubuntu 16.04 LTS / 18.04 LTS : PJSIP vulnerabilities (USN-8122-1)	Nessus	Ubuntu Local Security Checks	critical
424357	Alpine: multiple pjproject packages: security update to 2.11-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
424357	Alpine: multiple pjproject packages: security update to 2.11-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
157027	GLSA-202107-42 : PJSIP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium

Detections

Analytics

CVE-2020-15260

medium

Tenable Plugins

critical

medium

medium

medium