Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Libcurl | >= 7.13.0, <= 7.88.1 |
| Fedoraproject | Fedora | 36 |
| Debian | Debian Linux | 10.0 |
| Netapp | Active Iq Unified Manager | - |
| Netapp | Ontap 9 | - |
| Netapp | H300S Firmware | - |
| Netapp | H300S | - |
| Netapp | H500S Firmware | - |
| Netapp | H500S | - |
| Netapp | H700S Firmware | - |
| Netapp | H700S | - |
| Netapp | H410S Firmware | - |
| Netapp | H410S | - |
| Splunk | Universal Forwarder | >= 8.2.0, < 8.2.12 |
Related Weaknesses (CWE)
References
- https://hackerone.com/reports/1892780ExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202310-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory
- https://hackerone.com/reports/1892780ExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202310-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory
FAQ
What is CVE-2023-27535?
CVE-2023-27535 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 conn...
How severe is CVE-2023-27535?
CVE-2023-27535 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-27535?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Libcurl, Fedoraproject Fedora, Debian Debian Linux, Netapp Active Iq Unified Manager, Netapp Ontap 9.