linux-kernel - [PATCH 3.18 01/47] USB: hso: Fix OOB memory access in hso_probe/hso_get_config

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190111130956.410865338@linuxfoundation.org>
Date:   Fri, 11 Jan 2019 15:07:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hui Peng <benquike@...il.com>,
        Mathias Payer <mathias.payer@...elwelt.net>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.18 01/47] USB: hso: Fix OOB memory access in hso_probe/hso_get_config_data

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hui Peng <benquike@...il.com>

commit 5146f95df782b0ac61abde36567e718692725c89 upstream.

The function hso_probe reads if_num from the USB device (as an u8) and uses
it without a length check to index an array, resulting in an OOB memory read
in hso_probe or hso_get_config_data.

Add a length check for both locations and updated hso_probe to bail on
error.

This issue has been assigned CVE-2018-19985.

Reported-by: Hui Peng <benquike@...il.com>
Reported-by: Mathias Payer <mathias.payer@...elwelt.net>
Signed-off-by: Hui Peng <benquike@...il.com>
Signed-off-by: Mathias Payer <mathias.payer@...elwelt.net>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/usb/hso.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2814,6 +2814,12 @@ static int hso_get_config_data(struct us
 		return -EIO;
 	}

+	/* check if we have a valid interface */
+	if (if_num > 16) {
+		kfree(config_data);
+		return -EINVAL;
+	}
+
 	switch (config_data[if_num]) {
 	case 0x0:
 		result = 0;
@@ -2884,10 +2890,18 @@ static int hso_probe(struct usb_interfac

 	/* Get the interface/port specification from either driver_info or from
 	 * the device itself */
-	if (id->driver_info)
+	if (id->driver_info) {
+		/* if_num is controlled by the device, driver_info is a 0 terminated
+		 * array. Make sure, the access is in bounds! */
+		for (i = 0; i <= if_num; ++i)
+			if (((u32 *)(id->driver_info))[i] == 0)
+				goto exit;
 		port_spec = ((u32 *)(id->driver_info))[if_num];
-	else
+	} else {
 		port_spec = hso_get_config_data(interface);
+		if (port_spec < 0)
+			goto exit;
+	}

 	/* Check if we need to switch to alt interfaces prior to port
 	 * configuration */