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Date: Mon, 27 Jun 2022 08:20:42 +0200 (CEST)
From: Daniel Stenberg <daniel@...x.se>
To: curl security announcements -- curl users <curl-users@...ts.haxx.se>,
curl-announce@...ts.haxx.se, libcurl hacking <curl-library@...ts.haxx.se>,
oss-security@...ts.openwall.com
Subject: [SECURITY ADVISORY] curl: CVE-2022-32207: Unpreserved file
permissions
CVE-2022-32207: Unpreserved file permissions
============================================
Project curl Security Advisory, June 27th 2022 -
[Permalink](https://curl.se/docs/CVE-2022-32207.html)
VULNERABILITY
-------------
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
intended.
We are not aware of any exploit of this flaw.
INFO
----
CVE-2022-32207 was introduced in [commit
b834890a3fa3f52](https://github.com/curl/curl/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
-----------------
- 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!
THE SOLUTION
------------
A [fix for CVE-2022-32207](https://github.com/curl/curl/commit/20f9dd6bae50b)
RECOMMENDATIONS
--------------
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)
TIMELINE
--------
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.
CREDITS
-------
This issue was reported by Harry Sintonen. Patched by Daniel Stenberg.
Thanks a lot!
--
/ daniel.haxx.se
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