CVE-2020-9484

high

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.

References

https://lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1%40%3Cannounce.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

https://lists.debian.org/debian-lts-announce/2020/05/msg00020.html

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00057.html

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://security.netapp.com/advisory/ntap-20200528-0005/

https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html

http://seclists.org/fulldisclosure/2020/Jun/6

http://packetstormsecurity.com/files/157924/Apache-Tomcat-CVE-2020-9484-Proof-Of-Concept.html

https://security.gentoo.org/glsa/202006-21

https://lists.fedoraproject.org/archives/list/[email protected]/message/WJ7XHKWJWDNWXUJH6UB7CLIW4TWOZ26N/

https://lists.fedoraproject.org/archives/list/[email protected]/message/GIQHXENTLYUNOES4LXVNJ2NCUQQRF5VJ/

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html

https://www.oracle.com/security-alerts/cpujul2020.html

https://www.debian.org/security/2020/dsa-4727

https://usn.ubuntu.com/4448-1/

https://lists.apache.org/thread.html/[email protected]%3Ccommits.tomee.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Ccommits.tomee.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Ccommits.tomee.apache.org%3E

https://lists.apache.org/thread.html/rf[email protected]%3Ccommits.tomee.apache.org%3E

https://kc.mcafee.com/corporate/index?page=content&id=SB10332

https://www.oracle.com/security-alerts/cpuoct2020.html

https://usn.ubuntu.com/4596-1/

https://www.oracle.com/security-alerts/cpujan2021.html

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cannounce.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cannounce.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

http://www.openwall.com/lists/oss-security/2021/03/01/2

https://lists.apache.org/thread.html/[email protected]%3Ccommits.tomee.apache.org%3E

https://www.oracle.com/security-alerts/cpuApr2021.html

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cusers.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://www.oracle.com//security-alerts/cpujul2021.html

https://www.oracle.com/security-alerts/cpuoct2021.html

https://www.oracle.com/security-alerts/cpujan2022.html

https://www.oracle.com/security-alerts/cpujul2022.html

Details

Source: MITRE

Published: 2020-05-20

Updated: 2022-07-25

Type: CWE-502

Risk Information

CVSS v2

Base Score: 4.4

Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 7

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1

Severity: HIGH