In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with a double "To" header and an empty "To" tag causes a segmentation fault and crash. The reason is missing input validation in the "build_res_buf_from_sip_req" core function. This could result in denial of service and potentially the execution of arbitrary code.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7416-1 advisory.

    Stelios Tsampas discovered that Kamailio did not correctly handle certain memory operations, which could     lead to a buffer overflow. A remote attacker could possibly use this issue to cause a denial of service or     execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-2385)

    Henning Westerholt discovered that Kamailio did not correctly handle duplicated headers, which could lead     to a segmentation fault. A remote attacker could possibly use this issue to cause a denial of service or     execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-14767)

    It was discovered that Kamailio did not correctly handle parsing certain headers containing whitespace     characters. An authenticated attacker could possibly use this issue to gain access to unauthorized     resources and expose sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04     LTS. (CVE-2020-28361)

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.

CVE-2018-14767 Fix for missing input validation, which could result in denial of service and potentially the execution of arbitrary code.

For Debian 8 'Jessie', this problem has been fixed in version 4.2.0-2+deb8u4.

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 To header processing in kamailio, a very fast, dynamic and configurable SIP server. Missing input validation in the build_res_buf_from_sip_req function could result in denial of service and potentially the execution of arbitrary code.

ID	Name	Product	Family	Severity
233954	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Kamailio vulnerabilities (USN-7416-1)	Nessus	Ubuntu Local Security Checks	critical
111984	Debian DLA-1471-1 : kamailio security update	Nessus	Debian Local Security Checks	critical
111594	Debian DSA-4267-1 : kamailio - security update	Nessus	Debian Local Security Checks	critical

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