Operating System:

[Debian]

Published:

01 October 2021

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3260
                           curl security update
                              1 October 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           curl
Publisher:         Debian
Operating System:  Debian GNU/Linux
Impact/Access:     Provide Misleading Information -- Remote with User Interaction
                   Access Confidential Data       -- Remote with User Interaction
                   Reduced Security               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-22947 CVE-2021-22946 

Reference:         ESB-2021.3215
                   ESB-2021.3119.2

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html

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Debian LTS Advisory DLA-2773-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                    Thorsten Alteholz
September 30, 2021                            https://wiki.debian.org/LTS
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Package        : curl
Version        : 7.52.1-5+deb9u16
CVE ID         : CVE-2021-22946 CVE-2021-22947


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/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

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