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staging: rtl8723bs: fix missing shared-key auth challenge length check

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commit 2c56ef658a upstream.

The WEP shared-key authentication handler uses the challenge-text
element's attacker-controlled length without checking it against the
fixed 128-byte chg_txt buffer.

In OnAuthClient() the length from rtw_get_ie() - up to 255 - is used
to perform memcpy() into the 128-byte pmlmeinfo->chg_txt, so a
malicious AP sending a malformed WLAN_EID_CHALLENGE element can
overflow/underfill chg_txt by up to 127 bytes. It is reachable over the
air, before association, during shared-key authentication. In the case
of an overflow, the driver can write out of bounds. In the case of an
underfill, the driver can echo stale buffer memory.

The challenge text is defined to be exactly 128 octets, which is
already provided as the WLAN_AUTH_CHALLENGE_LEN define; require the
element to be exactly that length before use.

Fixes: 554c0a3abf ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Panagiotis Petrakopoulos <npetrakopoulos2003@gmail.com>
Link: https://patch.msgid.link/20260720082409.168379-1-npetrakopoulos2003@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Panagiotis Petrakopoulos
2026-08-19 18:13:11 +02:00
committed by Greg Kroah-Hartman
parent 1158b99312
commit 4ba402fd47
1 changed files with 1 additions and 1 deletions
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drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
+1 -1
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@@ -905,7 +905,7 @@ unsigned int OnAuthClient(struct adapter *padapter, union recv_frame *precv_fram
p = rtw_get_ie(pframe + WLAN_HDR_A3_LEN + _AUTH_IE_OFFSET_, WLAN_EID_CHALLENGE, (int *)&len,
pkt_len - WLAN_HDR_A3_LEN - _AUTH_IE_OFFSET_);
if (!p)
if (!p || len != WLAN_AUTH_CHALLENGE_LEN)
goto authclnt_fail;
memcpy((void *)(pmlmeinfo->chg_txt), (void *)(p + 2), len);