CVE-2023-38545

critical

Description

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.

From the Tenable Blog

CVE-2023-38545, CVE-2023-38546: Frequently Asked Questions for New Vulnerabilities in curl
CVE-2023-38545, CVE-2023-38546: Frequently Asked Questions for New Vulnerabilities in curl

Published: 2023-10-05

Frequently asked questions relating to two vulnerabilities patched in curl version 8.4.0

References

http://seclists.org/fulldisclosure/2024/Jan/34

http://seclists.org/fulldisclosure/2024/Jan/37

http://seclists.org/fulldisclosure/2024/Jan/38

https://lists.fedoraproject.org/archives/list/[email protected]/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/

https://security.netapp.com/advisory/ntap-20231027-0009/

https://security.netapp.com/advisory/ntap-20240201-0005/

https://support.apple.com/kb/HT214036

https://support.apple.com/kb/HT214057

https://support.apple.com/kb/HT214058

https://support.apple.com/kb/HT214063

Details

Source: Mitre, NVD

Published: 2023-10-18

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical