CVE-2022-42915

Description

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.

How to fix CVE-2022-42915

To remediate CVE-2022-42915, upgrade the affected package to a fixed version below.

• —upgrade to 7.80.0-r4 or later
• —upgrade to 7.86.0-1 or later

Is CVE-2022-42915 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 7.80.0-r4
• from 0, < 7.86.0-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2022-42915
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-42915