Skip to content
CVE PROGRAM SOURCE RECORD8.8 High

CVE-2023-38545

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
hackerone

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

curl curl

  • 8.4.0 to < 8.4.0affected
  • 7.69.0 to < 7.69.0unaffected

References