CVE-2023-27538 Auth bypass in https://github.com/curl/curl
Attackers can bypass authentication by reusing SSH connections with mismatched settings in libcurl, potentially accessing unauthorized resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-27538?
CVE-2023-27538 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 30 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-27538?
It affects 11 products.
Products include Broadcom Brocade Fabric Operating System Firmware, Debian Debian Linux, Fedoraproject Fedora, Haxx Libcurl, Netapp Active Iq Unified Manager, Netapp Clustered Data Ontap and 5 more.
How do I fix CVE-2023-27538?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-27538 being exploited?
There is no known exploitation of CVE-2023-27538 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2023-27538, AZL-25786, AZL-25803, AZL-25808, AZL-25848, AZL-34613 and 7 more.