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USN-4898-1: curl vulnerabilities

31 March 2021

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



  • 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.

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-4903-1: libcurl4-openssl-dev, libcurl3, curl, libcurl3-nss, libcurl4-doc, libcurl3-gnutls, libcurl4-nss-dev, curl-udeb, libcurl4-gnutls-dev, libcurl3-udeb