CVE-2020-9484

CVE-2020-9484: vulnerability in Apache Tomcat

Published · Updated

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30Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendepss 56%
What the vendors declare (VEX)

Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.

Red HatVEX document ↗
Affected
3 products (5 components)
Red Hat Enterprise Linux 8 · Red Hat JBoss Data Virtualization 6 · Red Hat OpenStack Platform 10 (Newton)
workaround: Users may configure the PersistenceManager with an appropriate value for sessionAttributeValueClassNameFilter to ensure that only application provided attributes are serialized and deserialized…
Fixed
24 products (199 components)
Red Hat JBoss Web Server 3.1 for RHEL 6 · Red Hat JBoss Web Server 3.1 for RHEL 7 · Red Hat JBoss Web Server 5.3 for RHEL 6 Server · Red Hat JBoss Web Server 5.3 for RHEL 7 Server · Red Hat JBoss Web Server 5.3 for RHEL 8 · and others 19
fix ↗
Not affected
7 products (12 components) — because the vulnerable code is not present in the product
Red Hat Software Collections · Red Hat OpenStack Platform 13 (Queens) · Red Hat Decision Manager 7 · Red Hat JBoss Data Grid 6 · Red Hat JBoss Enterprise Application Platform 6 · and others 2
When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 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.
Affected products
n/a · Apache Tomcat