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wpa: import fix for P2P provision discovery processing vulnerability

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Latest version available from: https://w1.fi/security/2021-1/

Vulnerability

A vulnerability was discovered in how wpa_supplicant processes P2P
(Wi-Fi Direct) provision discovery requests. Under a corner case
condition, an invalid Provision Discovery Request frame could end up
reaching a state where the oldest peer entry needs to be removed. With
a suitably constructed invalid frame, this could result in use
(read+write) of freed memory. This can result in an attacker within
radio range of the device running P2P discovery being able to cause
unexpected behavior, including termination of the wpa_supplicant process
and potentially code execution.

Vulnerable versions/configurations

wpa_supplicant v1.0-v2.9 with CONFIG_P2P build option enabled

An attacker (or a system controlled by the attacker) needs to be within
radio range of the vulnerable system to send a set of suitably
constructed management frames that trigger the corner case to be reached
in the management of the P2P peer table.

Note: FreeBSD base does not enable P2P.
This commit is contained in:
Cy Schubert 2021-03-16 17:06:17 -07:00
parent 1acf24a044
commit eeb26cf52c
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
contrib/wpa/src/p2p/p2p_pd.c
View File

@ -595,14 +595,12 @@ void p2p_process_prov_disc_req(struct p2p_data *p2p, const u8 *sa,
goto out;
}
dev = p2p_get_device(p2p, sa);
if (!dev) {
dev = p2p_get_device(p2p, sa);
if (!dev) {
p2p_dbg(p2p,
"Provision Discovery device not found "
MACSTR, MAC2STR(sa));
goto out;
}
p2p_dbg(p2p,
"Provision Discovery device not found "
MACSTR, MAC2STR(sa));
goto out;
}
} else if (msg.wfd_subelems) {
wpabuf_free(dev->info.wfd_subelems);