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CVE-2021-22925

Status Candidate

Overview

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

Related Files

Ubuntu Security Notice USN-5021-1
Posted Jul 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

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.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2021-22898, CVE-2021-22924, CVE-2021-22925
MD5 | c53bea031dddd5ede7e38a101eca93e4
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