A vulnerability was discovered in how p2p/p2p_pd.c in wpa_supplicant before 2.10 processes P2P (Wi-Fi Direct) provision discovery requests. It could result in denial of service or other impact (potentially execution of arbitrary code), for an attacker within radio range.
References: https://nvd.nist.gov/vuln/detail/CVE-2021-27803 Upstream patches: https://w1.fi/cgit/hostap/commit/?id=8460e3230988ef2ec13ce6b69b687e941f6cdb32 Signed-off-by: Stefan Ghinea <stefan.ghi...@windriver.com> --- .../hostapd/hostapd/CVE-2021-27803.patch | 58 +++++++++++++++++++ .../hostapd/hostapd_2.9.bb | 1 + 2 files changed, 59 insertions(+) create mode 100644 meta-oe/recipes-connectivity/hostapd/hostapd/CVE-2021-27803.patch diff --git a/meta-oe/recipes-connectivity/hostapd/hostapd/CVE-2021-27803.patch b/meta-oe/recipes-connectivity/hostapd/hostapd/CVE-2021-27803.patch new file mode 100644 index 000000000..004b1dbd1 --- /dev/null +++ b/meta-oe/recipes-connectivity/hostapd/hostapd/CVE-2021-27803.patch @@ -0,0 +1,58 @@ +From 8460e3230988ef2ec13ce6b69b687e941f6cdb32 Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <jo...@codeaurora.org> +Date: Tue, 8 Dec 2020 23:52:50 +0200 +Subject: [PATCH] P2P: Fix a corner case in peer addition based on PD Request + +p2p_add_device() may remove the oldest entry if there is no room in the +peer table for a new peer. This would result in any pointer to that +removed entry becoming stale. A corner case with an invalid PD Request +frame could result in such a case ending up using (read+write) freed +memory. This could only by triggered when the peer table has reached its +maximum size and the PD Request frame is received from the P2P Device +Address of the oldest remaining entry and the frame has incorrect P2P +Device Address in the payload. + +Fix this by fetching the dev pointer again after having called +p2p_add_device() so that the stale pointer cannot be used. + +Fixes: 17bef1e97a50 ("P2P: Add peer entry based on Provision Discovery Request") +Signed-off-by: Jouni Malinen <jo...@codeaurora.org> + +Upstream-Status: Backport +CVE: CVE-2021-27803 + +Reference to upstream patch: +[https://w1.fi/cgit/hostap/commit/?id=8460e3230988ef2ec13ce6b69b687e941f6cdb32] + +Signed-off-by: Stefan Ghinea <stefan.ghi...@windriver.com> +--- + src/p2p/p2p_pd.c | 12 +++++------- + 1 file changed, 5 insertions(+), 7 deletions(-) + +diff --git a/src/p2p/p2p_pd.c b/src/p2p/p2p_pd.c +index 3994ec0..05fd593 100644 +--- a/src/p2p/p2p_pd.c ++++ b/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); +-- +2.17.1 + diff --git a/meta-oe/recipes-connectivity/hostapd/hostapd_2.9.bb b/meta-oe/recipes-connectivity/hostapd/hostapd_2.9.bb index 68dc12370..ae497b6ae 100644 --- a/meta-oe/recipes-connectivity/hostapd/hostapd_2.9.bb +++ b/meta-oe/recipes-connectivity/hostapd/hostapd_2.9.bb @@ -12,6 +12,7 @@ SRC_URI = " \ file://init \ file://hostapd.service \ file://CVE-2019-16275.patch \ + file://CVE-2021-27803.patch \ " SRC_URI[md5sum] = "f188fc53a495fe7af3b6d77d3c31dee8" -- 2.17.1
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