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Ubuntu 16.04/14.04: USN-5079-4 Critical Curl Regression Alert

ubuntu
Calendar Grey September 21, 2021
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-5080-5 tackles a newly identified vulnerability in OpenSSL affecting Ubuntu 18.04 and 20.04 LTS systems.
USN-5079-2 introduced a regression in curl.

Summary

USN-5079-2 introduced a regression in curl.

Software Description:

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

Details:

USN-5079-2 fixed vulnerabilities in curl. One of the fixes introduced a

regression. This update fixes the problem.

Original advisory details:

Patrick Monnerat discovered that curl incorrectly handled upgrades to TLS.

When receiving certain responses from servers, curl would continue without

TLS even when the option to require a successful upgrade to TLS was

specified. (CVE-2021-22946)

Patrick Monnerat discovered that curl incorrectly handled responses

received before STARTTLS. A remote attacker could possibly use this issue

to inject responses and intercept communications. (CVE-2021-22947)

Topics%20covered

Topics Covered

security advisory update instructions ubuntu TLS curl regression libcurl

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+esm2
  libcurl3                        7.47.0-1ubuntu2.19+esm2
  libcurl3-gnutls                 7.47.0-1ubuntu2.19+esm2
  libcurl3-nss                    7.47.0-1ubuntu2.19+esm2

Ubuntu 14.04 ESM:
  curl                            7.35.0-1ubuntu2.20+esm9
  libcurl3                        7.35.0-1ubuntu2.20+esm9
  libcurl3-gnutls                 7.35.0-1ubuntu2.20+esm9
  libcurl3-nss                    7.35.0-1ubuntu2.20+esm9

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

References

https://ubuntu.com/security/notices/USN-5079-4

https://ubuntu.com/security/notices/USN-5079-1

https://bugs.launchpad.net/ubuntu/+source/curl/+bug/1944120

Severity
critical
Lowest
Low
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Critical

September 21, 2021

Topics%20covered

Topics Covered

security advisory update instructions ubuntu TLS curl regression libcurl

Package Information

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