A has been found in curl. The fix for CVE-2021-22898 doesn't remedy the vulnerability. A flaw in the option parser for sending NEW_ENV variables libcurl can pass uninitialized data from a stack-based buffer to the server. This issue leads to potentially revealing sensitive internal information to the server using a clear-text network protocol. The highest threat from this vulnerability is to confidentiality.
A has been found in curl. The fix for CVE-2021-22898 doesn't remedy the vulnerability. A flaw in the option parser for sending NEW_ENV variables libcurl can pass uninitialized data from a stack-based buffer to the server. This issue leads to potentially revealing sensitive internal information to the server using a clear-text network protocol. The highest threat from this vulnerability is to confidentiality.
This issue can be avoided by not setting any telnet options for the curl command line tool (using the -t / --telnet-option command line option) or the libcurl library (using the CURLOPT_TELNETOPTIONS option) when telnet protocol is not meant to be used.
If telnet protocol needs to be used with curl / libcurl, along with the NEW_ENV telnet option, ensure that no environment variable set via the NEW_ENV option has the name or value longer than 127 bytes.
Vulmon