USN-6237-2: curl regression

Releases

• Ubuntu 22.04 LTS

Packages

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

Details

USN-6237-1 fixed vulnerabilities in curl. The update caused a certificate
wildcard handling regression on Ubuntu 22.04 LTS. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

Hiroki Kurosawa discovered that curl incorrectly handled validating certain
certificate wildcards. A remote attacker could possibly use this issue to
spoof certain website certificates using IDN hosts. (CVE-2023-28321)

Hiroki Kurosawa discovered that curl incorrectly handled callbacks when
certain options are set by applications. This could cause applications
using curl to misbehave, resulting in information disclosure, or a denial
of service. (CVE-2023-28322)

It was discovered that curl incorrectly handled saving cookies to files. A
local attacker could possibly use this issue to create or overwrite files.
This issue only affected Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-32001)

Update instructions

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

Ubuntu 22.04

• libcurl3-gnutls - 7.81.0-1ubuntu1.13
• libcurl3-nss - 7.81.0-1ubuntu1.13
• libcurl4 - 7.81.0-1ubuntu1.13
• curl - 7.81.0-1ubuntu1.13

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

References

• https://launchpad.net/bugs/2028170