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CVE-2020-9484

Published: 20 May 2020

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.

Priority

Low

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package Release Status
tomcat7
Launchpad, Ubuntu, Debian
bionic Needs triage

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Does not exist

trusty Needs triage

upstream Needs triage

xenial Needs triage

tomcat8
Launchpad, Ubuntu, Debian
bionic Needs triage

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial
Released (8.0.32-1ubuntu1.13)
tomcat9
Launchpad, Ubuntu, Debian
bionic
Released (9.0.16-3ubuntu0.18.04.2)
eoan Ignored
(reached end-of-life)
focal
Released (9.0.31-1ubuntu0.1)
groovy Not vulnerable
(9.0.35-1)
hirsute Not vulnerable
(9.0.35-1)
impish Not vulnerable
(9.0.35-1)
jammy Not vulnerable
(9.0.35-1)
kinetic Not vulnerable
(9.0.35-1)
precise Does not exist

trusty Does not exist

upstream
Released (9.0.35-1)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 7.0
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H