CVE-2023-27538
Last modified
CVE-2023-27538 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. EPSS estimates a 1.16% chance of exploitation in the next 30 days.
Description
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Libcurl | >= 7.16.1, < 8.0.0 |
| Fedoraproject | Fedora | 36 |
| Debian | Debian Linux | 10.0 |
| Netapp | Active Iq Unified Manager | All versions |
| Netapp | Clustered Data Ontap | 9.0 |
| Broadcom | Brocade Fabric Operating System Firmware | All versions |
| Netapp | H300s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Splunk | Universal Forwarder | >= 8.2.0, < 8.2.12 |
| Splunk | Universal Forwarder | >= 9.0.0, < 9.0.6 |
| Splunk | Universal Forwarder | 9.1.0 |
References
- https://hackerone.com/reports/1898475Exploit, Third 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/1898475Exploit, Third Party Advisory
- https://security.gentoo.org/glsa/202310-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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