Apache Tomcat up to 7.0.103/8.5.54/9.0.34/10.0.0-M4 deserialization

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CVSS Meta Temp Score
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CTI Interest Score
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8.1$0-$5k0.07

A vulnerability classified as critical has been found in Apache Tomcat up to 7.0.103/8.5.54/9.0.34/10.0.0-M4 (Application Server Software). Affected is an unknown function. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-502. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared 05/20/2020. This vulnerability is traded as CVE-2020-9484 since 03/01/2020. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/18/2020).

A public exploit has been developed by masahiro331 in JHTML/JSP and been published 1 days after the advisory. It is declared as proof-of-concept. The exploit is shared for download at github.com. As 0-day the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entry 158169 is related to this item.

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VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.1

VulDB Base Score: 7.3
VulDB Temp Score: 6.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation (CWE-502)
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Author: masahiro331
Programming Language: 🔒
Download: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒
Exploit Delay Time: 🔍

Timelineinfoedit

03/01/2020 CVE assigned
05/20/2020 +80 days Advisory disclosed
05/21/2020 +1 days Exploit disclosed
05/21/2020 +0 days VulDB entry created
10/18/2020 +150 days VulDB last update

Sourcesinfoedit

Vendor: https://www.apache.org/

Status: Not defined
Confirmation: 🔒

CVE: CVE-2020-9484 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔒

Entryinfoedit

Created: 05/21/2020 09:33 AM
Updated: 10/18/2020 09:38 PM
Changes: (1) advisory_confirm_url
Complete: 🔍
Committer: misc

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