Hello all,
If you are using the Tomcat servlet container, please upgrade to the latest
version if you have not already done so.
Cheers,
Jennifer
---------- Forwarded message ---------
From: Mark Thomas <markt@xxxxxxxxxx>
Date: Wed, May 20, 2020 at 9:20 AM
Subject: [SECURITY] CVE-2020-9484 Apache Tomcat Remote Code Execution via
session persistence
To: Tomcat Users List <users@xxxxxxxxxxxxxxxxx>
Cc: Tomcat Developers List <dev@xxxxxxxxxxxxxxxxx>,
announce@xxxxxxxxxxxxxxxxx <announce@xxxxxxxxxxxxxxxxx>, <
announce@xxxxxxxxxx>
CVE-2020-9484 Apache Tomcat Remote Code Execution via session persistence
Severity: High
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.0-M4
Apache Tomcat 9.0.0.M1 to 9.0.34
Apache Tomcat 8.5.0 to 8.5.54
Apache Tomcat 7.0.0 to 7.0.103
Description:
If:
a) 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.
Mitigation:
- Upgrade to Apache Tomcat 10.0.0-M5 or later
- Upgrade to Apache Tomcat 9.0.35 or later
- Upgrade to Apache Tomcat 8.5.55 or later
- Upgrade to Apache Tomcat 7.0.104 or later
Alternatively, users may configure the PersistenceManager with an
appropriate value for sessionAttributeValueClassNameFilter to ensure
that only application provided attributes are serialized and deserialized.
Credit:
This issue was discovered and reported responsibly to the Apache Tomcat
Security Team by report by jarvis threedr3am of pdd security research
References:
[1] http://tomcat.apache.org/security-10.html
[2] http://tomcat.apache.org/security-9.html
[3] http://tomcat.apache.org/security-8.html
[4] http://tomcat.apache.org/security-7.html
