USN-4898-1: curl vulnerabilities

31 March 2021

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)

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: libcurl3, libcurl4-doc, libcurl4-openssl-dev, curl-udeb, libcurl3-udeb, libcurl3-gnutls, libcurl3-nss, libcurl4-nss-dev, curl, libcurl4-gnutls-dev