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Possible XSS Security Vulnerability in SafeBuffer#bytesplice

Moderate severity GitHub Reviewed Published Mar 15, 2023 to the GitHub Advisory Database • Updated Mar 15, 2023

Package

bundler activesupport (RubyGems)

Affected versions

>= 7.0.0, < 7.0.4.3
< 6.1.7.3

Patched versions

7.0.4.3
6.1.7.3

Description

There is a vulnerability in ActiveSupport if the new bytesplice method is called on a SafeBuffer with untrusted user input.
This vulnerability has been assigned the CVE identifier CVE-2023-28120.

Versions Affected: All. Not affected: None Fixed Versions: 7.0.4.3, 6.1.7.3

Impact

ActiveSupport uses the SafeBuffer string subclass to tag strings as html_safe after they have been sanitized.
When these strings are mutated, the tag is should be removed to mark them as no longer being html_safe.

Ruby 3.2 introduced a new bytesplice method which ActiveSupport did not yet understand to be a mutation.
Users on older versions of Ruby are likely unaffected.

All users running an affected release and using bytesplice should either upgrade or use one of the workarounds immediately.

Workarounds

Avoid calling bytesplice on a SafeBuffer (html_safe) string with untrusted user input.

References

Published to the GitHub Advisory Database Mar 15, 2023
Reviewed Mar 15, 2023
Last updated Mar 15, 2023

Severity

Moderate

Weaknesses

CVE ID

CVE-2023-28120

GHSA ID

GHSA-pj73-v5mw-pm9j

Source code

No known source code
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