CVE-2022-42915

curl before 7.86.0 has a double free. If curl is told to use an HTTP proxy for a transfer with a non-HTTP(S) URL, it sets up the connection to the remote server by issuing a CONNECT request to the proxy, and then tunnels the rest of the protocol through. An HTTP proxy might refuse this request (HTTP proxies often only allow outgoing connections to specific port numbers, like 443 for HTTPS) and instead return a non-200 status code to the client. Due to flaws in the error/cleanup handling, this could trigger a double free in curl if one of the following schemes were used in the URL for the transfer: dict, gopher, gophers, ldap, ldaps, rtmp, rtmps, or telnet. The earliest affected version is 7.77.0.

Weakness

The product calls free() twice on the same memory address.

Affected Software

Name	Vendor	Start Version	End Version
Curl	Haxx	7.77.0 (including)	7.86.0 (excluding)
JBoss Core Services for RHEL 8	RedHat	jbcs-httpd24-curl-0:7.86.0-2.el8jbcs	*
JBoss Core Services on RHEL 7	RedHat	jbcs-httpd24-curl-0:7.86.0-2.el7jbcs	*
Text-Only JBCS	RedHat	jbcs-httpd24-curl	*
Curl	Ubuntu	devel	*
Curl	Ubuntu	jammy	*
Curl	Ubuntu	kinetic	*
Curl	Ubuntu	trusty	*
Curl	Ubuntu	xenial	*

NVD	https://nvd.nist.gov/vuln/detail/CVE-2022-42915
CWE	https://cwe.mitre.org/data/definitions/415.html

Double Free

Weakness

Affected Software

Potential Mitigations

References