Ubuntu Security Notice 5021-1 - Harry Sintonen and Tomas Hoger discovered that curl incorrectly handled TELNET connections when the -t option was used on the command line. Uninitialized data possibly containing sensitive information could be sent to the remote server, contrary to expectations. Harry Sintonen discovered that curl incorrectly reused connections in the connection pool. This could result in curl reusing the wrong connections. Various other issues were also addressed.
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Ubuntu Security Notice USN-5021-1
July 22, 2021
curl vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- 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 and Tomas Hoger discovered that curl incorrectly handled
TELNET connections when the -t option was used on the command line.
Uninitialized data possibly containing sensitive information could be sent
to the remote server, contrary to expectations. (CVE-2021-22898,
CVE-2021-22925)
Harry Sintonen discovered that curl incorrectly reused connections in the
connection pool. This could result in curl reusing the wrong connections.
(CVE-2021-22924)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
curl 7.74.0-1ubuntu2.1
libcurl3-gnutls 7.74.0-1ubuntu2.1
libcurl3-nss 7.74.0-1ubuntu2.1
libcurl4 7.74.0-1ubuntu2.1
Ubuntu 20.04 LTS:
curl 7.68.0-1ubuntu2.6
libcurl3-gnutls 7.68.0-1ubuntu2.6
libcurl3-nss 7.68.0-1ubuntu2.6
libcurl4 7.68.0-1ubuntu2.6
Ubuntu 18.04 LTS:
curl 7.58.0-2ubuntu3.14
libcurl3-gnutls 7.58.0-2ubuntu3.14
libcurl3-nss 7.58.0-2ubuntu3.14
libcurl4 7.58.0-2ubuntu3.14
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5021-1
CVE-2021-22898, CVE-2021-22924, CVE-2021-22925
Package Information:
https://launchpad.net/ubuntu/+source/curl/7.74.0-1ubuntu2.1
https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.6
https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.14