medium
5.5
CWE
287 305
Advisory Published
CVE Published
Updated

CVE-2023-27538

First published: Thu Mar 16 2023(Updated: )

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.

Credit: support@hackerone.com support@hackerone.com

Affected SoftwareAffected VersionHow to fix
redhat/curl<8.0.0
8.0.0
IBM IBM® Engineering Requirements Management DOORS<=9.7.2.7
IBM IBM® Engineering Requirements Management DOORS Web Access<=9.7.2.7
Haxx Libcurl>=7.16.1<8.0.0
Fedoraproject Fedora=36
Debian Debian Linux=10.0
Netapp Active Iq Unified Manager Vmware Vsphere
NetApp Clustered Data ONTAP=9.0
Broadcom Brocade Fabric Operating System Firmware
All of
Netapp H300s Firmware
Netapp H300s
All of
Netapp H500s Firmware
Netapp H500s
All of
Netapp H700s Firmware
Netapp H700s
All of
Netapp H410s Firmware
Netapp H410s
Splunk Universal Forwarder>=8.2.0<8.2.12
Splunk Universal Forwarder>=9.0.0<9.0.6
Splunk Universal Forwarder=9.1.0
Netapp H300s Firmware
Netapp H300s
Netapp H500s Firmware
Netapp H500s
Netapp H700s Firmware
Netapp H700s
Netapp H410s Firmware
Netapp H410s

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-27538?

    The severity of CVE-2023-27538 is medium with a CVSSv3 score of 5.5.

  • What is CVE-2023-27538?

    CVE-2023-27538 is an authentication bypass vulnerability in libcurl prior to v8.0.0 that allows the reuse of a previously established SSH connection despite a modified SSH option.

  • How does CVE-2023-27538 affect Haxx Libcurl?

    Haxx Libcurl versions between 7.16.1 and 7.88.1 are affected by the CVE-2023-27538 vulnerability.

  • How does CVE-2023-27538 affect Fedora 36?

    CVE-2023-27538 affects Fedora 36.

  • Is there a fix for CVE-2023-27538?

    Yes, upgrading to libcurl version 8.0.0 or newer fixes the CVE-2023-27538 vulnerability.

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