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Ubuntu Security Notice USN-5412-1
May 11, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- 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:

Axel Chong discovered that curl incorrectly handled percent-encoded URL
separators. A remote attacker could possibly use this issue to trick curl
into using the wrong URL and bypass certain checks or filters. This issue
only affected Ubuntu 22.04 LTS. (CVE-2022-27780)

Florian Kohnhuser discovered that curl incorrectly handled returning a
TLS server's certificate chain details. A remote attacker could possibly
use this issue to cause curl to stop responding, resulting in a denial of
service. (CVE-2022-27781)

Harry Sintonen discovered that curl incorrectly reused a previous
connection when certain options had been changed, contrary to expectations.
(CVE-2022-27782)

Update instructions:

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

Ubuntu 22.04 LTS:
  curl                            7.81.0-1ubuntu1.2
  libcurl3-gnutls                 7.81.0-1ubuntu1.2
  libcurl3-nss                    7.81.0-1ubuntu1.2
  libcurl4                        7.81.0-1ubuntu1.2

Ubuntu 21.10:
  curl                            7.74.0-1.3ubuntu2.2
  libcurl3-gnutls                 7.74.0-1.3ubuntu2.2
  libcurl3-nss                    7.74.0-1.3ubuntu2.2
  libcurl4                        7.74.0-1.3ubuntu2.2

Ubuntu 20.04 LTS:
  curl                            7.68.0-1ubuntu2.11
  libcurl3-gnutls                 7.68.0-1ubuntu2.11
  libcurl3-nss                    7.68.0-1ubuntu2.11
  libcurl4                        7.68.0-1ubuntu2.11

Ubuntu 18.04 LTS:
  curl                            7.58.0-2ubuntu3.18
  libcurl3-gnutls                 7.58.0-2ubuntu3.18
  libcurl3-nss                    7.58.0-2ubuntu3.18
  libcurl4                        7.58.0-2ubuntu3.18

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

References:
  https://ubuntu.com/security/notices/USN-5412-1
  CVE-2022-27780, CVE-2022-27781, CVE-2022-27782

Package Information:
  https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/curl/7.74.0-1.3ubuntu2.2
  https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.11
  https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.18