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Ubuntu Security Notice USN-5894-1
February 27, 2023

curl vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in curl.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

Harry Sintonen and Tomas Hoger discovered that curl incorrectly handled
TELNET connections when the -t option was used on the command line.
Uninitialized data possibly containing sensitive information could be sent
to the remote server, contrary to expectations. This issue was only fixed
in Ubuntu 14.04 ESM. (CVE-2021-22898, CVE-2021-22925)

It was discovered that curl incorrectly handled denials when using HTTP
proxies. A remote attacker could use this issue to cause curl to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2022-43552)

Update instructions:

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

Ubuntu 16.04 ESM:
   curl                            7.47.0-1ubuntu2.19+esm7
   libcurl3                        7.47.0-1ubuntu2.19+esm7
   libcurl3-gnutls                 7.47.0-1ubuntu2.19+esm7
   libcurl3-nss                    7.47.0-1ubuntu2.19+esm7

Ubuntu 14.04 ESM:
   curl                            7.35.0-1ubuntu2.20+esm14
   libcurl3                        7.35.0-1ubuntu2.20+esm14
   libcurl3-gnutls                 7.35.0-1ubuntu2.20+esm14
   libcurl3-nss                    7.35.0-1ubuntu2.20+esm14

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

References:
   https://ubuntu.com/security/notices/USN-5894-1
   CVE-2021-22898, CVE-2021-22925, CVE-2022-43552