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Ubuntu 14.04 LTS / 16.04 LTS : Tomcat vulnerabilities (USN-8383-1)

critical Nessus Plugin ID 318841

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8383-1 advisory.

 It was discovered that Tomcat incorrectly handled digest authentication. A remote attacker could possibly use this issue to bypass authentication restrictions. (CVE-2026-43512)

 It was discovered that Tomcat incorrectly handled case sensitivity in LockOutRealm. A remote attacker could possibly use this issue to bypass account lockout protections and obtain sensitive information.
 (CVE-2026-43513)

 It was discovered that Tomcat incorrectly handled authorization when multiple method constraints defined the same HTTP method. A remote attacker could possibly use this issue to bypass authorization restrictions. (CVE-2026-43515)

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.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8383-1

Plugin Details

Severity: Critical

ID: 318841

File Name: ubuntu_USN-8383-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/5/2026

Updated: 6/5/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-43512

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libtomcat6-java, p-cpe:/a:canonical:ubuntu_linux:tomcat6-common, p-cpe:/a:canonical:ubuntu_linux:tomcat7, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:tomcat6-admin, p-cpe:/a:canonical:ubuntu_linux:tomcat7-examples, p-cpe:/a:canonical:ubuntu_linux:libservlet2.5-java, p-cpe:/a:canonical:ubuntu_linux:tomcat6-extras, p-cpe:/a:canonical:ubuntu_linux:tomcat6-user, p-cpe:/a:canonical:ubuntu_linux:libservlet2.4-java, p-cpe:/a:canonical:ubuntu_linux:libtomcat7-java, p-cpe:/a:canonical:ubuntu_linux:tomcat7-common, p-cpe:/a:canonical:ubuntu_linux:tomcat7-user, p-cpe:/a:canonical:ubuntu_linux:tomcat6, p-cpe:/a:canonical:ubuntu_linux:tomcat6-examples, p-cpe:/a:canonical:ubuntu_linux:tomcat7-admin, p-cpe:/a:canonical:ubuntu_linux:libservlet3.0-java

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 6/4/2026

Vulnerability Publication Date: 5/5/2026

Reference Information

CVE: CVE-2026-43512, CVE-2026-43513, CVE-2026-43515

IAVA: 2026-A-0475

USN: 8383-1