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author | Cy Schubert <cy@FreeBSD.org> | 2021-03-17 00:06:17 +0000 |
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committer | Cy Schubert <cy@FreeBSD.org> | 2021-03-24 08:57:20 +0000 |
commit | 98bb0d48c1d07c221905d23ea00dfb1c5b97207b (patch) | |
tree | 1fec7d1106583b2da31ad5629102879d2684ad69 | |
parent | e36c2f704635a101e993fa2d1890bd44c33ebcdd (diff) | |
download | src-98bb0d48c1d07c221905d23ea00dfb1c5b97207b.tar.gz src-98bb0d48c1d07c221905d23ea00dfb1c5b97207b.zip |
wpa: import fix for P2P provision discovery processing vulnerability
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.
(cherry picked from commit eeb26cf52c4c51e1571253d57684c442aa79a98d)
-rw-r--r-- | contrib/wpa/src/p2p/p2p_pd.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/contrib/wpa/src/p2p/p2p_pd.c b/contrib/wpa/src/p2p/p2p_pd.c index 3994ec03f86b..05fd593494ef 100644 --- a/contrib/wpa/src/p2p/p2p_pd.c +++ b/contrib/wpa/src/p2p/p2p_pd.c @@ -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); |