CVE-2023-38545

critical · 9.8

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.

9.8

CVSS

78.5%

EPSS (exploit prob.)

100th

EPSS percentile

2023-10-18

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-787

Affected products

Vendor	Product	Affected versions
haxx	libcurl	>= 7.69.0, < 8.4.0
fedoraproject	fedora	37
netapp	active_iq_unified_manager	all versions
netapp	active_iq_unified_manager	all versions
netapp	oncommand_insight	all versions
netapp	oncommand_workflow_automation	all versions
microsoft	windows_10_1809	< 10.0.17763.5122
microsoft	windows_10_21h2	< 10.0.19044.3693
microsoft	windows_10_22h2	< 10.0.19045.3693
microsoft	windows_11_21h2	< 10.0.22000.2600
microsoft	windows_11_22h2	< 10.0.22621.2715
microsoft	windows_11_23h2	< 10.0.22631.2715
microsoft	windows_server_2019	< 10.0.17763.5122
microsoft	windows_server_2022	< 10.0.20348.2113

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2023-38545