FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

curl -- SOCKS5 heap buffer overflow

Affected packages
7.69.0 < curl < 8.4.0
cmake-core < 3.27.8


VuXML ID d6c19e8c-6806-11ee-9464-b42e991fc52e
Discovery 2023-09-30
Entry 2023-10-11
Modified 2023-10-11

The curl team reports:

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the hostname to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that hostname can be is 255 bytes. If the hostname is detected to be longer than 255 bytes, curl switches to local name resolving and instead passes on the resolved address only to the proxy. Due to a 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 hostname to the target buffer instead of copying just the resolved address there.


CVE Name CVE-2023-38545