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XSS vulnerability in revision view changed path "copyfrom" locations

Low
cmpilato published GHSA-jvpj-293q-q53h Jan 4, 2023

Package

No package listed

Affected versions

<= 1.1.29, 1.2.2

Patched versions

1.1.30, 1.2.3

Description

Impact

The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a Subversion repository exposed by an otherwise trusted ViewVC instance. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create.

Patches

Users should update to at least version 1.2.3 (if they are using a 1.2.x version of ViewVC) or 1.1.30 (if they are using a 1.1.x version). ViewVC 1.0.x is no longer supported, so users of that release lineage should implement one of the following workarounds.

Workarounds

Users can edit their ViewVC EZT view templates to manually HTML-escape changed path "copyfrom paths" during rendering. Locate in your template set's revision.ezt file references to those changed paths, and wrap them with [format "html"] and [end]. For most users, that means that references to [changes.copy_path] will become [format "html"][changes.copy_path][end]. (This workaround should be reverted after upgrading to a patched version of ViewVC, else "copyfrom path" names will be doubly escaped.)

References

See #311 for details.

Severity

Low

CVE ID

CVE-2023-22464

Weaknesses