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Timing attack on HMAC signature comparison in Apache Tapestry

Critical severity GitHub Reviewed Published Sep 26, 2019 to the GitHub Advisory Database • Updated Jan 27, 2023

Package

maven org.apache.tapestry:tapestry-core (Maven)

Affected versions

>= 5.4, < 5.4.5

Patched versions

5.4.5

Description

The code which checks HMAC in form submissions used String.equals() for comparisons, which results in a timing side channel for the comparison of the HMAC signatures. This could lead to remote code execution if an attacker is able to determine the correct signature for their payload. The comparison should be done with a constant time algorithm instead.

References

Published by the National Vulnerability Database Sep 16, 2019
Reviewed Sep 23, 2019
Published to the GitHub Advisory Database Sep 26, 2019
Last updated Jan 27, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

8.937%
(95th percentile)

Weaknesses

CVE ID

CVE-2019-10071

GHSA ID

GHSA-fgmr-vx7c-5wj6

Source code

No known source code
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