1. Ubuntu Security Notices
  2. USN-4898-1

USN-4898-1: curl vulnerabilities

Publication date

31 March 2021

Overview

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

Releases

Packages

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

Details

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)

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.10 groovy curl –  7.68.0-1ubuntu4.3
libcurl3-gnutls –  7.68.0-1ubuntu4.3
libcurl3-nss –  7.68.0-1ubuntu4.3
libcurl4 –  7.68.0-1ubuntu4.3
20.04 focal curl –  7.68.0-1ubuntu2.5
libcurl3-gnutls –  7.68.0-1ubuntu2.5
libcurl3-nss –  7.68.0-1ubuntu2.5
libcurl4 –  7.68.0-1ubuntu2.5
18.04 bionic curl –  7.58.0-2ubuntu3.13
libcurl3-gnutls –  7.58.0-2ubuntu3.13
libcurl3-nss –  7.58.0-2ubuntu3.13
libcurl4 –  7.58.0-2ubuntu3.13
16.04 xenial curl –  7.47.0-1ubuntu2.19
libcurl3 –  7.47.0-1ubuntu2.19
libcurl3-gnutls –  7.47.0-1ubuntu2.19
libcurl3-nss –  7.47.0-1ubuntu2.19

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References

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