Debian 9: DLA-2773-1 Critical: Curl TLS Issues and Fix Instructions

Two issues have been found in curl, a command line tool and an easy-to-use
client-side library for transferring data with URL syntax.

CVE-2021-22946
Crafted answers from a server might force clients to not use TLS on
connections though TLS was required and expected.

CVE-2021-22947
When using STARTTLS to initiate a TLS connection, the server might
send multiple answers before the TLS upgrade and such the client
would handle them as being trusted. This could be used by a
MITM-attacker to inject fake response data.


For Debian 9 stretch, these problems have been fixed in version
7.52.1-5+deb9u16.

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/source-package/curl

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