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USN-5079-2: curl vulnerabilities

15 September 2021

Several security issues were fixed in curl.



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


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

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

Ubuntu 16.04
Ubuntu 14.04

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

Related notices

  • USN-5079-1: libcurl3-gnutls, libcurl4-doc, libcurl4-openssl-dev, libcurl4-gnutls-dev, libcurl4-nss-dev, libcurl3-nss, curl, libcurl4