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             AUSCERT External Security Bulletin Redistribution

                     USN-4898-1: curl vulnerabilities
                               1 April 2021


        AusCERT Security Bulletin Summary

Product:           curl
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Access Confidential Data       -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-22890 CVE-2021-22876 

Reference:         ESB-2021.1114

Original Bulletin: 

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USN-4898-1: curl vulnerabilities
31 March 2021

curl could be made to expose sensitive information over the network.

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS


  o curl - HTTP, HTTPS, and FTP client and client libraries


Viktor Szakats discovered that curl did not strip off user credentials
from referrer header fields. A remote attacker could possibly use this
issue to obtain sensitive information. ( CVE-2021-22876 )

Mingtao Yang discovered that curl incorrectly handled session tickets when
using an HTTPS proxy. A remote attacker in control of an HTTPS proxy could
use this issue to bypass certificate checks and intercept communications.
This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10.
( CVE-2021-22890 )

Update instructions

The problem can be corrected by updating your system to the following package

Ubuntu 20.10

  o libcurl3-nss - 7.68.0-1ubuntu4.3
  o curl - 7.68.0-1ubuntu4.3
  o libcurl3-gnutls - 7.68.0-1ubuntu4.3
  o libcurl4 - 7.68.0-1ubuntu4.3

Ubuntu 20.04

  o libcurl3-nss - 7.68.0-1ubuntu2.5
  o curl - 7.68.0-1ubuntu2.5
  o libcurl3-gnutls - 7.68.0-1ubuntu2.5
  o libcurl4 - 7.68.0-1ubuntu2.5

Ubuntu 18.04

  o libcurl3-nss - 7.58.0-2ubuntu3.13
  o curl - 7.58.0-2ubuntu3.13
  o libcurl3-gnutls - 7.58.0-2ubuntu3.13
  o libcurl4 - 7.58.0-2ubuntu3.13

Ubuntu 16.04

  o libcurl3-nss - 7.47.0-1ubuntu2.19
  o curl - 7.47.0-1ubuntu2.19
  o libcurl3-gnutls - 7.47.0-1ubuntu2.19
  o libcurl3 - 7.47.0-1ubuntu2.19

In general, a standard system update will make all the necessary changes.


  o CVE-2021-22890
  o CVE-2021-22876

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