CVE-2023-27535
Published: 20 March 2023
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.
Priority
Status
Package | Release | Status |
---|---|---|
curl Launchpad, Ubuntu, Debian |
bionic |
Released
(7.58.0-2ubuntu3.24)
|
focal |
Released
(7.68.0-1ubuntu2.18)
|
|
jammy |
Released
(7.81.0-1ubuntu1.10)
|
|
kinetic |
Released
(7.85.0-1ubuntu0.5)
|
|
lunar |
Released
(7.88.1-6ubuntu2)
|
|
trusty |
Released
(7.35.0-1ubuntu2.20+esm15)
|
|
upstream |
Pending
(8.0.0)
|
|
xenial |
Released
(7.47.0-1ubuntu2.19+esm8)
|
|
Patches: upstream: https://github.com/curl/curl/commit/8f4608468b890dc |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | None |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |