Debian LTS: Security Advisory for tomcat8 (DLA-2279-1)

Published: 2020-07-17 12:33:41
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Summary:
The remote host is missing an update for the 'tomcat8' Linux Distribution Package(s) announced via the DLA-2279-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several security vulnerabilities have been discovered in the Tomcat servlet and JSP engine. CVE-2020-9484 When using Apache Tomcat and an attacker is able to control the contents and name of a file on the server, and b) the server is configured to use the PersistenceManager with a FileStore, and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter='null' (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized, and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over, then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed. CVE-2020-11996 A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

Affected Versions:
'tomcat8' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 8.5.54-0+deb9u2. We recommend that you upgrade your tomcat8 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2020-11996
https://nvd.nist.gov/vuln/detail/CVE-2020-9484

References:

https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html
https://security-tracker.debian.org/tracker/DLA-2279-1
https://bugs.debian.org/961209

Severity
Medium
CVSS Score
5.0
Published
2020-07-17
Modified
2020-07-20
Category
Debian Local Security Checks

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