On Thu, Mar 31, 2022 at 12:38 PM Ralph Siemsen <[email protected]> wrote:
>
> Fix heap overflow when appending prepare writes
>
> The code shall check if the prepare writes would append more the
> allowed maximum attribute length.
>
> Upstream-Status: Backport
> [https://github.com/bluez/bluez/commit/591c546c536b42bef696d027f64aa22434f8c3f0]
> CVE: CVE-2022-0204
>
> Signed-off-by: Ralph Siemsen <[email protected]>
> ---
> Status on other branches:
> - master/kirkstone 5.64 includes the fix
> - honister 5.61 needs patch
> - hardknott 5.56 needs patch
>
> meta/recipes-connectivity/bluez5/bluez5.inc | 1 +
> .../bluez5/bluez5/CVE-2022-0204.patch | 66 +++++++++++++++++++
> 2 files changed, 67 insertions(+)
> create mode 100644 meta/recipes-connectivity/bluez5/bluez5/CVE-2022-0204.patch
>
> diff --git a/meta/recipes-connectivity/bluez5/bluez5.inc
> b/meta/recipes-connectivity/bluez5/bluez5.inc
> index 7cf061dcf6..4d4348898a 100644
> --- a/meta/recipes-connectivity/bluez5/bluez5.inc
> +++ b/meta/recipes-connectivity/bluez5/bluez5.inc
> @@ -55,6 +55,7 @@ SRC_URI =
> "${KERNELORG_MIRROR}/linux/bluetooth/bluez-${PV}.tar.xz \
> file://CVE-2021-0129.patch \
> file://CVE-2021-3588.patch \
> file://CVE-2021-3658.patch \
> + file://CVE-2022-0204.patch \
seems to have tabs vs spaces problem.
> "
> S = "${WORKDIR}/bluez-${PV}"
>
> diff --git a/meta/recipes-connectivity/bluez5/bluez5/CVE-2022-0204.patch
> b/meta/recipes-connectivity/bluez5/bluez5/CVE-2022-0204.patch
> new file mode 100644
> index 0000000000..646b5ddfc8
> --- /dev/null
> +++ b/meta/recipes-connectivity/bluez5/bluez5/CVE-2022-0204.patch
> @@ -0,0 +1,66 @@
> +From 0d328fdf6564b67fc2ec3533e3da201ebabcc9e3 Mon Sep 17 00:00:00 2001
> +From: Luiz Augusto von Dentz <[email protected]>
> +Date: Tue, 8 Jun 2021 16:46:49 -0700
> +Subject: [PATCH] shared/gatt-server: Fix heap overflow when appending prepare
> + writes
> +
> +The code shall check if the prepare writes would append more the
> +allowed maximum attribute length.
> +
> +Fixes https://github.com/bluez/bluez/security/advisories/GHSA-479m-xcq5-9g2q
> +
> +Upstream-Status: Backport
> [https://github.com/bluez/bluez/commit/591c546c536b42bef696d027f64aa22434f8c3f0]
> +Signed-off-by: Ralph Siemsen <[email protected]>
> +CVE: CVE-2022-0204
> +
> +---
> + src/shared/gatt-server.c | 22 ++++++++++++++++++++++
> + 1 file changed, 22 insertions(+)
> +
> +diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c
> +index 0c25a97..20e14bc 100644
> +--- a/src/shared/gatt-server.c
> ++++ b/src/shared/gatt-server.c
> +@@ -816,6 +816,20 @@ static uint8_t authorize_req(struct bt_gatt_server
> *server,
> + server->authorize_data);
> + }
> +
> ++static uint8_t check_length(uint16_t length, uint16_t offset)
> ++{
> ++ if (length > BT_ATT_MAX_VALUE_LEN)
> ++ return BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN;
> ++
> ++ if (offset > BT_ATT_MAX_VALUE_LEN)
> ++ return BT_ATT_ERROR_INVALID_OFFSET;
> ++
> ++ if (length + offset > BT_ATT_MAX_VALUE_LEN)
> ++ return BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN;
> ++
> ++ return 0;
> ++}
> ++
> + static void write_cb(struct bt_att_chan *chan, uint8_t opcode, const void
> *pdu,
> + uint16_t length, void *user_data)
> + {
> +@@ -846,6 +860,10 @@ static void write_cb(struct bt_att_chan *chan, uint8_t
> opcode, const void *pdu,
> + (opcode == BT_ATT_OP_WRITE_REQ) ? "Req" :
> "Cmd",
> + handle);
> +
> ++ ecode = check_length(length, 0);
> ++ if (ecode)
> ++ goto error;
> ++
> + ecode = check_permissions(server, attr, BT_ATT_PERM_WRITE_MASK);
> + if (ecode)
> + goto error;
> +@@ -1353,6 +1371,10 @@ static void prep_write_cb(struct bt_att_chan *chan,
> uint8_t opcode,
> + util_debug(server->debug_callback, server->debug_data,
> + "Prep Write Req - handle: 0x%04x", handle);
> +
> ++ ecode = check_length(length, offset);
> ++ if (ecode)
> ++ goto error;
> ++
> + ecode = check_permissions(server, attr, BT_ATT_PERM_WRITE_MASK);
> + if (ecode)
> + goto error;
> --
> 2.25.1
>
>
>
>
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