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Local information disclosure via system temporary directory

Moderate severity GitHub Reviewed Published Apr 22, 2021 in eclipse-ee4j/jersey • Updated Jan 27, 2023

Package

maven org.glassfish.jersey.core:jersey-common (Maven)

Affected versions

>= 2.28, <= 2.33
>= 3.0.0, <= 3.0.1

Patched versions

2.34
3.0.2

Description

Impact

Eclipse Jersey 2.28 - 2.33 and Eclipse Jersey 3.0.0 - 3.0.1 contains a local information disclosure vulnerability. This is due to the use of the File.createTempFile which creates a file inside of the system temporary directory with the permissions: -rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system. As such, if the contents written is security sensitive, it can be disclosed to other local users.

Workaround

This issue can be mitigated by manually setting the java.io.tmpdir system property when launching the JVM.

Patches

Jersey 2.34 and 3.0.2 forward sets the correct permissions on the temporary file created by Jersey.

References

Similar Vulnerabilities

Similar, but not the same:


Original Disclosure:

Hello Jersey Security Team,

Utilizing a custom CodeQL query written as a part of the GitHub Security Lab Bug Bounty program, I've unearthed a local temporary file information disclosure vulnerability.

You can see the custom CodeQL query utilized here:
https://lgtm.com/query/8831016213790320486/

This particular vulnerability exists because on unix-like systems (not including modern versions of MacOS) the system temporary directory is shared between all users. As such, failure to correctly set file permissions and/or verify exclusive creation of directories can lead to either local information disclosure, or local file hijacking by another user.

This vulnerability impacts the following locations in this project's source:

This vulnerability exists because of the vulnerability in the Utils.createTempFile:

https://github.com/eclipse-ee4j/jersey/blob/01c6a32a2064aeff2caa8133472e33affeb8a29a/core-common/src/main/java/org/glassfish/jersey/message/internal/Utils.java#L42-L53

This is because File.createTempFile creates a file inside of the system temporary directory with the permissions: -rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system.

If there is sensitive information written to these files, it is disclosed to other local users on this system.

The fix for this vulnerability is to use the Files API (instead of the File API) to create temporary files/directories as this new API correctly sets the posix file permissions.

References

@waynebeaton waynebeaton published to eclipse-ee4j/jersey Apr 22, 2021
Published by the National Vulnerability Database Apr 22, 2021
Reviewed Apr 22, 2021
Published to the GitHub Advisory Database Apr 23, 2021
Last updated Jan 27, 2023

Severity

Moderate

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

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:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.044%
(11th percentile)

CVE ID

CVE-2021-28168

GHSA ID

GHSA-c43q-5hpj-4crv

Source code

No known source code

Credits

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