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
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
|
|
lunar |
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
|
|
lunar |
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)
|
|
lunar |
Not vulnerable
(9.0.35-1)
|
|
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 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9484
- https://github.com/apache/tomcat/commit/bb33048e3f9b4f2b70e4da2e6c4e34ca89023b1b (10.0.0-M5)
- https://github.com/apache/tomcat/commit/3aa8f28db7efb311cdd1b6fe15a9cd3b167a2222 (9.0.35)
- https://github.com/apache/tomcat/commit/ec08af18d0f9ddca3f2d800ef66fe7fd20afef2f (8.5.55)
- https://github.com/apache/tomcat/commit/53e30390943c18fca0c9e57dbcc14f1c623cfd06 (7.0.104)
- https://lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1%40%3Cannounce.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rf70f53af27e04869bdac18b1fc14a3ee529e59eb12292c8791a77926@%3Cusers.tomcat.apache.org%3E
- https://ubuntu.com/security/notices/USN-4448-1
- https://ubuntu.com/security/notices/USN-4596-1
- https://ubuntu.com/security/notices/USN-5360-1
- NVD
- Launchpad
- Debian