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Date: Mon, 27 Jun 2022 08:21:14 +0200 (CEST)
From: Daniel Stenberg <>
To: curl security announcements -- curl users <>,, libcurl hacking <>,
Subject: [SECURITY ADVISORY] curl: FTP-KRB bad message verification

CVE-2022-32208: FTP-KRB bad message verification

Project curl Security Advisory, June 27th 2022 -


When curl does FTP transfers secured by krb5, it handles message verification
failures wrongly. This flaw makes it possible for a Man-In-The-Middle attack
to go unnoticed and even allows it to inject data to the client.

We are not aware of any exploit of this flaw.


CVE-2022-32208 was introduced in [commit
54967d2a3a](, shipped
in curl 7.16.4.

This flaw typically makes curl insert `599 ` (+ terminating null) into the
data where it detects the error, then the attackers data. It forces the
attacker to be somewhat creative to handle this initial hard-coded 5 byte
sequence of "junk".

FTP-KRB is a rarely used feature.

CWE-924: Improper Enforcement of Message Integrity During Transmission in a
Communication Channel

Severity: Low


- Affected versions: curl 7.16.4 to and including 7.83.1
- Not affected versions: curl < 7.16.4 and curl >= 7.84.0

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


A [fix for CVE-2022-32208](


  A - Upgrade curl to version 7.84.0

  B - Apply the patch to your local version

  C - Do not use KRB-FTP


This issue was reported to the curl project on June 2, 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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