USN-4898-1: curl vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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

• 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

Ubuntu 20.04

• 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

Ubuntu 18.04

• 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

Ubuntu 16.04

• 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

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

References

• CVE-2021-22890
• CVE-2021-22876

Related notices

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