A curl security update has been released for Debian GNU/Linux 10 to address multiple vulnerabilities in the cURL library.

DSA 4881-1: curl security update

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Debian Security Advisory DSA-4881-1 security@debian.org
  https://www.debian.org/security/ Alessandro Ghedini
March 30, 2021   https://www.debian.org/security/faq
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Package : curl
CVE ID : CVE-2020-8169 CVE-2020-8177 CVE-2020-8231 CVE-2020-8284
CVE-2020-8285 CVE-2020-8286 CVE-2021-22876 CVE-2021-22890
Debian Bug : 965280 965281 968831 977161 977162 977163

Multiple vulnerabilities were discovered in cURL, an URL transfer library:

CVE-2020-8169

Marek Szlagor reported that libcurl could be tricked into prepending
a part of the password to the host name before it resolves it,
potentially leaking the partial password over the network and to the
DNS server(s).

CVE-2020-8177

sn reported that curl could be tricked by a malicious server into
overwriting a local file when using th -J (--remote-header-name) and
-i (--include) options in the same command line.

CVE-2020-8231

Marc Aldorasi reported that libcurl might use the wrong connection
when an application using libcurl's multi API sets the option
CURLOPT_CONNECT_ONLY, which could lead to information leaks.

CVE-2020-8284

Varnavas Papaioannou reported that a malicious server could use the
PASV response to trick curl into connecting back to an arbitrary IP
address and port, potentially making curl extract information about
services that are otherwise private and not disclosed.

CVE-2020-8285

xnynx reported that libcurl could run out of stack space when using
tha FTP wildcard matching functionality (CURLOPT_CHUNK_BGN_FUNCTION).

CVE-2020-8286

It was reported that libcurl didn't verify that an OCSP response
actually matches the certificate it is intended to.

CVE-2021-22876

Viktor Szakats reported that libcurl does not strip off user
credentials from the URL when automatically populating the Referer
HTTP request header field in outgoing HTTP requests.

CVE-2021-22890

Mingtao Yang reported that, when using an HTTPS proxy and TLS 1.3,
libcurl could confuse session tickets arriving from the HTTPS proxy
as if they arrived from the remote server instead. This could allow
an HTTPS proxy to trick libcurl into using the wrong session ticket
for the host and thereby circumvent the server TLS certificate check.

For the stable distribution (buster), these problems have been fixed in
version 7.64.0-4+deb10u2.

We recommend that you upgrade your curl packages.

For the detailed security status of curl please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/curl

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/