CVEvulnerability

CVE-2023-38545

9.8 CRITICAL Published 2023-10-18 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-10-18
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-787

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.

Affected configurations

• haxx libcurl (>= 7.69.0 < 8.4.0) • fedoraproject fedora 37 • netapp active iq unified manager • netapp oncommand insight • netapp oncommand workflow automation • 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)

Related

Weakness · CWE (1)

  • CWE-787 Out-of-bounds Write weakness

References