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CVE-2021-32744: Unauthenticated attacker could gain access to currently open files

Critical
timar published GHSA-32xj-9x82-q9jw Jul 21, 2021

Package

loolwsd

Affected versions

< 6.4.9-6 and <4.2.17-2

Patched versions

6.4.9-6 and 4.2.17-2

Description

Impact

Unauthenticated attacker is able to gain access to files which are currently opened by other users in the Collabora Online editor. For successful exploitation the attacker is required to guess the file identifier - the predictability of this file identifier is dependent on external file-storage implementations (this is a potential "IDOR" - Insecure Direct Object Reference - vulnerability)

There is no known workaround except updating the Collabora Online application to one of the patched releases.

Patches

Users should upgrade to Collabora Online 4.2.17-2 or higher, or Collabora Online 6.4.9-6 or higher.

For more information

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Severity

Critical

CVE ID

CVE-2021-32744

Weaknesses

Credits