vulnerability

Red Hat: CVE-2023-27535: curl: FTP too eager connection reuse (Multiple Advisories)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:C/I:N/A:N)
Published
Mar 30, 2023
Added
May 15, 2023
Modified
Nov 14, 2025

Description

An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.

Solutions

no-fix-redhat-rpm-packageredhat-upgrade-curlredhat-upgrade-curl-debuginforedhat-upgrade-curl-debugsourceredhat-upgrade-curl-minimalredhat-upgrade-curl-minimal-debuginforedhat-upgrade-libcurlredhat-upgrade-libcurl-debuginforedhat-upgrade-libcurl-develredhat-upgrade-libcurl-minimalredhat-upgrade-libcurl-minimal-debuginfo
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