CVE-2020-9484
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 9.0.35-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 9.0.35-1 |
| sid | Fixed | 9.0.35-1 |
| forky | Fixed | 9.0.35-1 |
| bullseye | Fixed | 9.0.35-1 |
| bookworm | Fixed | 9.0.35-1 |
Package impact
References
- https://security.archlinux.org/ASA-202006-7
- https://www.suse.com/security/cve/CVE-2020-9484.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-9484
- https://github.com/apache/tomcat/commit/3aa8f28db7efb311cdd1b6fe15a9cd3b167a2222.patch
- https://github.com/apache/tomcat/commit/4785433a226a20df6acbea49296e1ce7e23de453
- https://github.com/apache/tomcat/commit/6d66e99ef85da93e4d2c2a536ca51aa3418bfaf4
- https://github.com/apache/tomcat/commit/74b105657ffbd1d1de80455f03446c3bbf30d1f5
- https://github.com/apache/tomcat/commit/93f0cc403a9210d469afc2bd9cf03ab3251c6f35
- https://github.com/apache/tomcat/commit/bb33048e3f9b4f2b70e4da2e6c4e34ca89023b1b
- https://tomcat.apache.org/security-9.html
- https://tomcat.apache.org/security-8.html
- https://tomcat.apache.org/security-7.html
- https://tomcat.apache.org/security-10.html
- https://security.netapp.com/advisory/ntap-20200528-0005
- https://security.gentoo.org/glsa/202006-21
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WJ7XHKWJWDNWXUJH6UB7CLIW4TWOZ26N
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GIQHXENTLYUNOES4LXVNJ2NCUQQRF5VJ
- https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html
- https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html
- https://bugzilla.suse.com/show_bug.cgi?id=1171928
- https://usn.ubuntu.com/4448-1
- https://usn.ubuntu.com/4596-1
- https://www.debian.org/security/2020/dsa-4727
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.