MEDIUM 5.5 Microsoft

CVE-2023-27538

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.

Microsoft Security Update 2023-Mar: 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.

Affected Products

References

Published: 2023-03-14 · Source: Microsoft · Feed updated: 2026-09-17
This medium severity vulnerability with a CVSS score of 5.5 was published on 2023-03-14 via Microsoft. Affected: azl3 cmake 3.21.4-10 on Azure Linux 3.0, cbl2 curl 8.0.1-1 on CBL Mariner 2.0, cbl2 rust 1.72.0-2 on CBL Mariner 2.0 and 5 more.
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