// For flags

CVE-2023-27536

curl: GSS delegation too eager connection re-use

Severity Score

5.9
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.

A flaw was found in the Curl package. Libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, the GSS delegation setting was left out from the configuration match checks, making them match too easily, affecting krb5/kerberos/negotiate/GSSAPI transfers.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-03-02 CVE Reserved
  • 2023-03-21 CVE Published
  • 2024-08-02 CVE Updated
  • 2024-08-02 First Exploit
  • 2024-10-20 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-287: Improper Authentication
  • CWE-305: Authentication Bypass by Primary Weakness
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Netapp
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H300s Firmware
Search vendor "Netapp" for product "H300s Firmware"
--
Affected
in Netapp
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H300s
Search vendor "Netapp" for product "H300s"
--
Safe
Netapp
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H500s Firmware
Search vendor "Netapp" for product "H500s Firmware"
--
Affected
in Netapp
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H500s
Search vendor "Netapp" for product "H500s"
--
Safe
Netapp
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H700s Firmware
Search vendor "Netapp" for product "H700s Firmware"
--
Affected
in Netapp
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H700s
Search vendor "Netapp" for product "H700s"
--
Safe
Netapp
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H410s Firmware
Search vendor "Netapp" for product "H410s Firmware"
--
Affected
in Netapp
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H410s
Search vendor "Netapp" for product "H410s"
--
Safe
Haxx
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Libcurl
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>= 7.22.0 <= 7.88.1
Search vendor "Haxx" for product "Libcurl" and version " >= 7.22.0 <= 7.88.1"
-
Affected
Fedoraproject
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Fedora
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36
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-
Affected
Debian
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Debian Linux
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10.0
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-
Affected
Netapp
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Active Iq Unified Manager
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-vmware_vsphere
Affected
Netapp
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Ontap
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9
Search vendor "Netapp" for product "Ontap" and version "9"
-
Affected
Splunk
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Universal Forwarder
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>= 8.2.0 < 8.2.12
Search vendor "Splunk" for product "Universal Forwarder" and version " >= 8.2.0 < 8.2.12"
-
Affected
Splunk
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Universal Forwarder
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>= 9.0.0 < 9.0.6
Search vendor "Splunk" for product "Universal Forwarder" and version " >= 9.0.0 < 9.0.6"
-
Affected
Splunk
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Universal Forwarder
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9.1.0
Search vendor "Splunk" for product "Universal Forwarder" and version "9.1.0"
-
Affected