[USN-5079-4] curl regression
Leonidas S. Barbosa
leo.barbosa at canonical.com
Tue Sep 21 13:22:48 UTC 2021
==========================================================================
Ubuntu Security Notice USN-5079-4
September 21, 2021
curl regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM
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)
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://launchpad.net/bugs/1944120
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