curl: CVE-2021-22890

Debian Bug report logs - #986270
curl: CVE-2021-22890

Reply or subscribe to this bug.

Toggle useless messages

Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: curl: CVE-2021-22890

Date: Fri, 02 Apr 2021 09:22:57 +0200

Source: curl
Version: 7.74.0-1.1
Severity: serious
Tags: security upstream
Justification: security regression from stable
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 7.64.0-4
Control: fixed -1 7.64.0-4+deb10u2

Hi,

The following vulnerability was published for curl, filling as RC so
it appears on list of issues to be fixed before bullseye release.

CVE-2021-22890[0]:
| curl 7.63.0 to and including 7.75.0 includes vulnerability that allows
| a malicious HTTPS proxy to MITM a connection due to bad handling of
| TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl
| can confuse session tickets arriving from the HTTPS proxy but work as
| if they arrived from the remote server and then wrongly "short-cut"
| the host handshake. When confusing the tickets, a HTTPS proxy can
| trick libcurl to use the wrong session ticket resume for the host and
| thereby circumvent the server TLS certificate check and make a MITM
| attack to be possible to perform unnoticed. Note that such a malicious
| HTTPS proxy needs to provide a certificate that curl will accept for
| the MITMed server for an attack to work - unless curl has been told to
| ignore the server certificate check.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-22890
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22890
[1] https://curl.se/docs/CVE-2021-22890.html

Regards,
Salvatore

Send a report that this bug log contains spam.