Date: Mon, 20 Mar 2023 08:26:09 +0100 (CET) From: Daniel Stenberg <daniel@...x.se> To: curl security announcements -- curl users <curl-users@...ts.haxx.se>, curl-announce@...ts.haxx.se, libcurl hacking <curl-library@...ts.haxx.se>, oss-security@...ts.openwall.com Subject: [SECURITY ADVISORY] curl: CVE-2023-27535: FTP too eager connection reuse CVE-2023-27535: FTP too eager connection reuse ============================================== Project curl Security Advisory, March 20th 2023 - [Permalink](https://curl.se/docs/CVE-2023-27535.html) VULNERABILITY ------------- libcurl would reuse a previously created FTP connection even when one or more options had been changed that could have made the effective user a very different one, thus leading to the doing the second transfer with wrong credentials. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, several FTP settings were left out from the configuration match checks, making them match too easily. The settings in questions are `CURLOPT_FTP_ACCOUNT`, `CURLOPT_FTP_ALTERNATIVE_TO_USER`, `CURLOPT_FTP_SSL_CCC` and `CURLOPT_USE_SSL` level. We are not aware of any exploit of this flaw. INFO ---- CVE-2023-27535 was introduced in [commit 177dbc7be07125582](https://github.com/curl/curl/commit/177dbc7be07125582), shipped in curl 7.13.0. CWE-305: Authentication Bypass by Primary Weakness Severity: Medium AFFECTED VERSIONS ----------------- - Affected versions: curl 7.13.0 to and including 7.88.1 - Not affected versions: curl < 7.13.0 and curl >= 8.0.0 libcurl is used by many applications, but not always advertised as such! THE SOLUTION ------------ A [fix for CVE-2023-27535](https://github.com/curl/curl/commit/8f4608468b890dc) RECOMMENDATIONS -------------- A - Upgrade curl to version 8.0.0 B - Apply the patch to your local version TIMELINE -------- This issue was reported to the curl project on March 5, 2023. We contacted distros@...nwall on March 13, 2023. curl 8.0.0 was released on March 20 2023, coordinated with the publication of this advisory. CREDITS ------- - Reported-by: Harry Sintonen - Patched-by: Daniel Stenberg Thanks a lot! -- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://curl.se/support.html
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