medium
5.9
CWE
287 305
Advisory Published
CVE Published
Updated

CVE-2023-27535

First published: Thu Mar 16 2023(Updated: )

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.

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>=7.13.0<=7.88.1
Fedoraproject Fedora=36
Debian Debian Linux=10.0
Netapp Active Iq Unified Manager Vmware Vsphere
Netapp Ontap 9
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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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-27535?

    CVE-2023-27535 is an authentication bypass vulnerability in libcurl <8.0.0.

  • What is the severity of CVE-2023-27535?

    CVE-2023-27535 has a severity rating of medium (5.9).

  • Which software is affected by CVE-2023-27535?

    CVE-2023-27535 affects Haxx Libcurl, Fedora 36, Debian Debian Linux, Apple iPadOS, Netapp Ontap 9, Apple macOS Ventura, Apple macOS Big Sur, Apple macOS Monterey.

  • How does the vulnerability in libcurl <8.0.0 occur?

    The vulnerability in libcurl <8.0.0 occurs in the FTP connection reuse feature, allowing wrong credentials to be used during subsequent transfers.

  • Are there any references for CVE-2023-27535?

    Yes, here are some references for CVE-2023-27535: [1] [2] [3]

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