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Date: Mon, 27 Jun 2022 08:20:42 +0200 (CEST)
From: Daniel Stenberg <>
To: curl security announcements -- curl users <>,, libcurl hacking <>,
Subject: [SECURITY ADVISORY] curl: CVE-2022-32207: Unpreserved file

CVE-2022-32207: Unpreserved file permissions

Project curl Security Advisory, June 27th 2022 -


When curl saves cookies, alt-svc and hsts data to local files, it makes the
operation atomic by finalizing the operation with a rename from a temporary
name to the final target file name.

In that rename operation, it might accidentally *widen* the permissions for
the target file, leaving the updated file accessible to more users than

We are not aware of any exploit of this flaw.


CVE-2022-32207 was introduced in [commit
b834890a3fa3f52](, shipped
in curl 7.69.0.

This problem can be worked-around by using a strict umask.

CWE-281: Improper Preservation of Permissions

Severity: Medium


- Affected versions: curl 7.69.0 to and including 7.83.1
- Not affected versions: curl < 7.69.0 and curl >= 7.84.0

libcurl is used by many applications, but not always advertised as such!


A [fix for CVE-2022-32207](


  A - Upgrade curl to version 7.84.0

  B - Apply the patch to your local version

  C - Make extra precautions to protect saved files (ie strict umask)


This issue was reported to the curl project on May 17, 2022. We contacted
distros@...nwall on June 20.

libcurl 7.84.0 was released on June 27 2022, coordinated with the publication
of this advisory.


This issue was reported by Harry Sintonen. Patched by Daniel Stenberg.

Thanks a lot!


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