CVE-2023-38546 Information

Description

This flaw allows an attacker to insert cookies at will into a running program using libcurl if the specific series of conditions are met.

libcurl performs transfers. In its API an application creates asy handles\nthat are the individual handles for single transfers.

libcurl provides a function call that duplicates en easy handle called curl_easy_duphandle.

If a transfer has cookies enabled when the handle is duplicated the cookie-enable state is also cloned - but without cloning the actual cookies. If the source handle did not read any cookies from a specific file on disk the cloned version of the handle would instead store the file name as none (using the four ASCII letters no quotes).

Subsequent use of the cloned handle that does not explicitly set a source to load cookies from would then inadvertently load cookies from a file named none - if such a file exists and is readable in the current directory of the program using libcurl. And if using the correct file format of course.

Reference

https://curl.se/docs/CVE-2023-38546.html https://curl.se/docs/CVE-2023-38546.html This flaw allows an attacker to insert cookies at will into a running program using libcurl if the specific series of conditions are met.

libcurl performs transfers. In its API an application creates asy handles\nthat are the individual handles for single transfers.

libcurl provides a function call that duplicates en easy handle called curl_easy_duphandle.***](https://curl.se/libcurl/c/curl_easy_duphandle.html).)

If a transfer has cookies enabled when the handle is duplicated the cookie-enable state is also cloned

but without cloning the actual cookies. If the source handle did not read any cookies from a specific file on disk the cloned version of the handle would instead store the file name as none (using the four ASCII letters no quotes).

Subsequent use of the cloned handle that does not explicitly set a source to load cookies from would then inadvertently load cookies from a file named none

if such a file exists and is readable in the current directory of the program using libcurl. And if using the correct file format of course.