CVE-2023-27536

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.

Weakness

The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Affected Software

Name	Vendor	Start Version	End Version
Libcurl	Haxx	7.22.0 (including)	7.88.1 (including)
Red Hat Enterprise Linux 8	RedHat	curl-0:7.61.1-30.el8_8.3	*
Red Hat Enterprise Linux 8.6 Extended Update Support	RedHat	curl-0:7.61.1-22.el8_6.12	*
Red Hat Enterprise Linux 9	RedHat	curl-0:7.76.1-26.el9	*
Red Hat Enterprise Linux 9	RedHat	curl-0:7.76.1-26.el9	*
Curl	Ubuntu	bionic	*
Curl	Ubuntu	esm-infra-legacy/trusty	*
Curl	Ubuntu	esm-infra/bionic	*
Curl	Ubuntu	esm-infra/focal	*
Curl	Ubuntu	esm-infra/xenial	*
Curl	Ubuntu	focal	*
Curl	Ubuntu	jammy	*
Curl	Ubuntu	kinetic	*
Curl	Ubuntu	lunar	*
Curl	Ubuntu	trusty	*
Curl	Ubuntu	trusty/esm	*
Curl	Ubuntu	upstream	*
Curl	Ubuntu	xenial	*

NVD	https://nvd.nist.gov/vuln/detail/CVE-2023-27536
CWE	https://cwe.mitre.org/data/definitions/305.html

Authentication Bypass by Primary Weakness

Weakness

Affected Software

References