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)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Pending
(8.0.0)
|
|
| xenial |
Released
(7.47.0-1ubuntu2.19+esm8)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
Patches: upstream: https://github.com/curl/curl/commit/8f4608468b890dc |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |