In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. The reason is missing input validation in the crcitt_string_array core function for calculating a CRC hash for To tags. (An additional error is present in the check_via_address core function: this function also misses input validation.) This could result in denial of service and potentially the execution of arbitrary code.

The remote Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6022-1 advisory.

    It was discovered that Kamailio did not properly sanitize SIP messages under certain circumstances. An     attacker could use this vulnerability to cause a denial of service or possibly execute arbitrary code.
    This issue only affected Ubuntu 16.04 ESM and 18.04 ESM. (CVE-2018-16657)

    It was discovered that Kamailio did not properly validate INVITE requests under certain circumstances. An     attacker could use this vulnerability to cause a denial of service or possibly execute arbitrary code.
    (CVE-2020-27507)

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.

It was discovered that there was a denial of service and a potential arbitrary code execution vulnerability in the kamailio SIP server.

A specially crafted SIP message with an invalid 'Via' header could cause a segmentation fault and crash Kamailio due to missing input validation.

For Debian 8 'Jessie', this issue has been fixed in kamailio version 4.2.0-2+deb8u5.

We recommend that you upgrade your kamailio packages.

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.

Henning Westerholt discovered a flaw related to the Via header processing in kamailio, a very fast, dynamic and configurable SIP server. An unauthenticated attacker can take advantage of this flaw to mount a denial of service attack via a specially crafted SIP message with an invalid Via header.

ID	Name	Product	Family	Severity
174344	Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM : Kamailio vulnerabilities (USN-6022-1)	Nessus	Ubuntu Local Security Checks	critical
117464	Debian DLA-1503-1 : kamailio security update	Nessus	Debian Local Security Checks	critical
117437	Debian DSA-4292-1 : kamailio - security update	Nessus	Debian Local Security Checks	critical

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