A curl security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 22.04 LTS, and 22.10.

USN-5964-1: curl vulnerabilities

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Ubuntu Security Notice USN-5964-1
March 20, 2023

curl vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in curl.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

Harry Sintonen discovered that curl incorrectly handled certain TELNET
connection options. Due to lack of proper input scrubbing, curl could pass
on user name and telnet options to the server as provided, contrary to
expectations. (CVE-2023-27533)

Harry Sintonen discovered that curl incorrectly handled special tilde
characters when used with SFTP paths. A remote attacker could possibly use
this issue to circumvent filtering. (CVE-2023-27534)

Harry Sintonen discovered that curl incorrectly reused certain FTP
connections. This could lead to the wrong credentials being reused,
contrary to expectations. (CVE-2023-27535)

Harry Sintonen discovered that curl incorrectly reused connections when the
GSS delegation option had been changed. This could lead to the option being
reused, contrary to expectations. (CVE-2023-27536)

Harry Sintonen discovered that curl incorrectly reused certain SSH
connections. This could lead to the wrong credentials being reused,
contrary to expectations. (CVE-2023-27538)

Update instructions:

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

Ubuntu 22.10:
curl 7.85.0-1ubuntu0.5
libcurl3-gnutls 7.85.0-1ubuntu0.5
libcurl3-nss 7.85.0-1ubuntu0.5
libcurl4 7.85.0-1ubuntu0.5

Ubuntu 22.04 LTS:
curl 7.81.0-1ubuntu1.10
libcurl3-gnutls 7.81.0-1ubuntu1.10
libcurl3-nss 7.81.0-1ubuntu1.10
libcurl4 7.81.0-1ubuntu1.10

Ubuntu 20.04 LTS:
curl 7.68.0-1ubuntu2.18
libcurl3-gnutls 7.68.0-1ubuntu2.18
libcurl3-nss 7.68.0-1ubuntu2.18
libcurl4 7.68.0-1ubuntu2.18

Ubuntu 18.04 LTS:
curl 7.58.0-2ubuntu3.24
libcurl3-gnutls 7.58.0-2ubuntu3.24
libcurl3-nss 7.58.0-2ubuntu3.24
libcurl4 7.58.0-2ubuntu3.24

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

References:
https://ubuntu.com/security/notices/USN-5964-1
CVE-2023-27533, CVE-2023-27534, CVE-2023-27535, CVE-2023-27536,
CVE-2023-27538

Package Information:
https://launchpad.net/ubuntu/+source/curl/7.85.0-1ubuntu0.5
https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.10
https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.18
https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.24