USN-5079-3: curl vulnerabilities
21 September 2021
USN-5079-1 introduced a regression in curl.
Releases
Packages
- curl - HTTP, HTTPS, and FTP client and client libraries
Details
USN-5079-1 fixed vulnerabilities in curl. One of the fixes introduced a
regression on Ubuntu 18.04 LTS. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that curl incorrect handled memory when sending data to
an MQTT server. A remote attacker could use this issue to cause curl to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2021-22945)
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 18.04
-
libcurl3-gnutls
-
7.58.0-2ubuntu3.16
-
libcurl3-nss
-
7.58.0-2ubuntu3.16
-
libcurl4
-
7.58.0-2ubuntu3.16
-
curl
-
7.58.0-2ubuntu3.16
In general, a standard system update will make all the necessary changes.