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

FreeBSD -- Stack overflow in ping(8)

Affected packages
13.1 <= FreeBSD < 13.1_5
12.3 <= FreeBSD < 12.3_10


VuXML ID a005aea9-47bb-11ee-8e38-002590c1f29c
Discovery 2022-11-29
Entry 2023-08-31

Problem Description:

ping reads raw IP packets from the network to process responses in the pr_pack() function. As part of processing a response ping has to reconstruct the IP header, the ICMP header and if present a "quoted packet," which represents the packet that generated an ICMP error. The quoted packet again has an IP header and an ICMP header.

The pr_pack() copies received IP and ICMP headers into stack buffers for further processing. In so doing, it fails to take into account the possible presence of IP option headers following the IP header in either the response or the quoted packet. When IP options are present, pr_pack() overflows the destination buffer by up to 40 bytes.


The memory safety bugs described above can be triggered by a remote host, causing the ping program to crash.

The ping process runs in a capability mode sandbox on all affected versions of FreeBSD and is thus very constrained in how it can interact with the rest of the system at the point where the bug can occur.


CVE Name CVE-2022-23093
FreeBSD Advisory