1. Ubuntu Security Notices
  2. USN-5079-2

USN-5079-2: curl vulnerabilities

Publication date

15 September 2021

Overview

Several security issues were fixed in curl.

Releases

Packages

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

Details

USN-5079-1 fixed several vulnerabilities in curl. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

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)

USN-5079-1 fixed several vulnerabilities in curl. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

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)

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
16.04 xenial curl –  7.47.0-1ubuntu2.19+esm1  
libcurl3 –  7.47.0-1ubuntu2.19+esm1  
libcurl3-gnutls –  7.47.0-1ubuntu2.19+esm1  
libcurl3-nss –  7.47.0-1ubuntu2.19+esm1  
14.04 trusty curl –  7.35.0-1ubuntu2.20+esm8  
libcurl3 –  7.35.0-1ubuntu2.20+esm8  
libcurl3-gnutls –  7.35.0-1ubuntu2.20+esm8  
libcurl3-nss –  7.35.0-1ubuntu2.20+esm8  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›