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Debian DLA-2133-1 : tomcat7 security update
critical Nessus Plugin ID 134243
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Synopsis
The remote Debian host is missing a security update.Description
Several security vulnerabilities have been discovered in the Tomcat servlet and JSP engine.CVE-2019-17569
The refactoring in 7.0.98 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
CVE-2020-1935
The HTTP header parsing code used an approach to end-of-line (EOL) parsing that allowed some invalid HTTP headers to be parsed as valid.
This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
CVE-2020-1938
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. Prior to Tomcat 7.0.100, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required.
Note that Debian already disabled the AJP connector by default. Mitigation is only required if the AJP port was made accessible to untrusted users.
For Debian 8 'Jessie', these problems have been fixed in version 7.0.56-3+really7.0.100-1.
We recommend that you upgrade your tomcat7 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.
Solution
Upgrade the affected packages.See Also
https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html
Plugin Details
Severity: Critical
ID: 134243
File Name: debian_DLA-2133.nasl
Version: 1.7
Type: local
Agent: unix
Family: Debian Local Security Checks
Published: 3/6/2020
Updated: 3/25/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 9.0
CVSS v2
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2020-1938
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9.4
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:H/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:debian:debian_linux:tomcat7-user, p-cpe:/a:debian:debian_linux:tomcat7-examples, p-cpe:/a:debian:debian_linux:libtomcat7-java, p-cpe:/a:debian:debian_linux:tomcat7-admin, p-cpe:/a:debian:debian_linux:tomcat7-docs, p-cpe:/a:debian:debian_linux:tomcat7, cpe:/o:debian:debian_linux:8.0, p-cpe:/a:debian:debian_linux:libservlet3.0-java, p-cpe:/a:debian:debian_linux:tomcat7-common, p-cpe:/a:debian:debian_linux:libservlet3.0-java-doc
Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 3/4/2020
Vulnerability Publication Date: 2/24/2020
CISA Known Exploited Vulnerability Due Dates: 3/17/2022