File xrdp-CVE-2022-23480.patch of Package failed_xrdp
From 6680c506e4562715e3ff500c114208dac88863cb Mon Sep 17 00:00:00 2001
From: matt335672 <30179339+matt335672@users.noreply.github.com>
Date: Tue, 6 Dec 2022 12:48:57 +0000
Subject: [PATCH 4/9] CVE-2022-23480
Added length checking to redirector response parsing
---
sesman/chansrv/devredir.c | 151 +++++++++++++++++++++++++++++++-------
1 file changed, 123 insertions(+), 28 deletions(-)
diff --git a/sesman/chansrv/devredir.c b/sesman/chansrv/devredir.c
index a44d47e6..7faa9bfc 100644
--- a/sesman/chansrv/devredir.c
+++ b/sesman/chansrv/devredir.c
@@ -131,10 +131,10 @@ static void devredir_send_server_core_cap_req(void);
static void devredir_send_server_clientID_confirm(void);
static void devredir_send_server_user_logged_on(void);
-static void devredir_proc_client_core_cap_resp(struct stream *s);
-static void devredir_proc_client_devlist_announce_req(struct stream *s);
-static void devredir_proc_client_devlist_remove_req(struct stream *s);
-static void devredir_proc_device_iocompletion(struct stream *s);
+static int devredir_proc_client_core_cap_resp(struct stream *s);
+static int devredir_proc_client_devlist_announce_req(struct stream *s);
+static int devredir_proc_client_devlist_remove_req(struct stream *s);
+static int devredir_proc_device_iocompletion(struct stream *s);
static void devredir_proc_query_dir_response(IRP *irp,
struct stream *s_in,
tui32 DeviceId,
@@ -323,6 +323,11 @@ devredir_data_in(struct stream *s, int chan_id, int chan_flags, int length,
}
/* read header from incoming data */
+ if (!s_check_rem_and_log(ls, 4, "Parsing [MS-RDPEFS] RDPDR_HEADER"))
+ {
+ rv = -1;
+ goto done;
+ }
xstream_rd_u16_le(ls, comp_type);
xstream_rd_u16_le(ls, pktID);
@@ -340,27 +345,34 @@ devredir_data_in(struct stream *s, int chan_id, int chan_flags, int length,
switch (pktID)
{
case PAKID_CORE_CLIENTID_CONFIRM:
- xstream_seek(ls, 2); /* major version, we ignore it */
- xstream_rd_u16_le(ls, minor_ver);
- xstream_rd_u32_le(ls, g_clientID);
+ if (!s_check_rem_and_log(ls, 6, "Parsing [MS-RDPEFS] DR_CORE_CLIENT_ANNOUNCE_RSP"))
+ {
+ rv = -1;
+ }
+ else
+ {
+ xstream_seek(ls, 2); /* major version, we ignore it */
+ xstream_rd_u16_le(ls, minor_ver);
+ xstream_rd_u32_le(ls, g_clientID);
- g_client_rdp_version = minor_ver;
+ g_client_rdp_version = minor_ver;
- switch (minor_ver)
- {
- case RDP_CLIENT_50:
- break;
+ switch (minor_ver)
+ {
+ case RDP_CLIENT_50:
+ break;
- case RDP_CLIENT_51:
- break;
+ case RDP_CLIENT_51:
+ break;
- case RDP_CLIENT_52:
- break;
+ case RDP_CLIENT_52:
+ break;
- case RDP_CLIENT_60_61:
- break;
+ case RDP_CLIENT_60_61:
+ break;
+ }
+ // LK_TODO devredir_send_server_clientID_confirm();
}
- // LK_TODO devredir_send_server_clientID_confirm();
break;
case PAKID_CORE_CLIENT_NAME:
@@ -378,19 +390,19 @@ devredir_data_in(struct stream *s, int chan_id, int chan_flags, int length,
break;
case PAKID_CORE_CLIENT_CAPABILITY:
- devredir_proc_client_core_cap_resp(ls);
+ rv = devredir_proc_client_core_cap_resp(ls);
break;
case PAKID_CORE_DEVICELIST_ANNOUNCE:
- devredir_proc_client_devlist_announce_req(ls);
+ rv = devredir_proc_client_devlist_announce_req(ls);
break;
case PAKID_CORE_DEVICELIST_REMOVE:
- devredir_proc_client_devlist_remove_req(ls);
+ rv = devredir_proc_client_devlist_remove_req(ls);
break;
case PAKID_CORE_DEVICE_IOCOMPLETION:
- devredir_proc_device_iocompletion(ls);
+ rv = devredir_proc_device_iocompletion(ls);
break;
default:
@@ -727,8 +739,9 @@ devredir_send_drive_dir_request(IRP *irp, tui32 device_id,
* @brief process client's response to our core_capability_req() msg
*
* @param s stream containing client's response
+ * @return 0 for success, -1 otherwise
*****************************************************************************/
-static void
+static int
devredir_proc_client_core_cap_resp(struct stream *s)
{
int i;
@@ -738,15 +751,31 @@ devredir_proc_client_core_cap_resp(struct stream *s)
tui32 cap_version;
char *holdp;
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CORE_CAPABLITY_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u16_le(s, num_caps);
xstream_seek(s, 2); /* padding */
for (i = 0; i < num_caps; i++)
{
holdp = s->p;
+ if (!s_check_rem_and_log(s, 8, "Parsing [MS-RDPEFS] CAPABILITY_HEADER"))
+ {
+ return -1;
+ }
xstream_rd_u16_le(s, cap_type);
xstream_rd_u16_le(s, cap_len);
xstream_rd_u32_le(s, cap_version);
+ /* Convert the length to a remaining length. Underflow is possible,
+ * but this is an unsigned type so that's OK */
+ cap_len -= (s->p - holdp);
+ if (cap_len > 0 &&
+ !s_check_rem_and_log(s, cap_len, "Parsing [MS-RDPEFS] CAPABILITY_HEADER length"))
+ {
+ return -1;
+ }
switch (cap_type)
{
@@ -779,11 +808,12 @@ devredir_proc_client_core_cap_resp(struct stream *s)
scard_init();
break;
}
- s->p = holdp + cap_len;
+ xstream_seek(s, cap_len);
}
+ return 0;
}
-static void
+static int
devredir_proc_client_devlist_announce_req(struct stream *s)
{
unsigned int i;
@@ -795,12 +825,22 @@ devredir_proc_client_devlist_announce_req(struct stream *s)
enum NTSTATUS response_status;
/* get number of devices being announced */
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CORE_DEVICELIST_ANNOUNCE_REQ"))
+ {
+ return -1;
+ }
+
xstream_rd_u32_le(s, device_count);
LOG_DEVEL(LOG_LEVEL_DEBUG, "num of devices announced: %d", device_count);
for (i = 0; i < device_count; i++)
{
+ if (!s_check_rem_and_log(s, 4 + 4 + 8 + 4,
+ "Parsing [MS-RDPEFS] DEVICE_ANNOUNCE"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, device_type);
xstream_rd_u32_le(s, g_device_id);
/* get preferred DOS name
@@ -816,6 +856,12 @@ devredir_proc_client_devlist_announce_req(struct stream *s)
/* Read the device data length from the stream */
xstream_rd_u32_le(s, device_data_len);
+ if (device_data_len > 0 && !
+ !s_check_rem_and_log(s, device_data_len,
+ "Parsing [MS-RDPEFS] DEVICE_ANNOUNCE devdata"))
+ {
+ return -1;
+ }
switch (device_type)
{
@@ -881,9 +927,11 @@ devredir_proc_client_devlist_announce_req(struct stream *s)
devredir_send_server_device_announce_resp(g_device_id,
response_status);
}
+
+ return 0;
}
-static void
+static int
devredir_proc_client_devlist_remove_req(struct stream *s)
{
unsigned int i;
@@ -891,7 +939,16 @@ devredir_proc_client_devlist_remove_req(struct stream *s)
tui32 device_id;
/* get number of devices being announced */
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_DEVICELIST_REMOVE"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, device_count);
+ if (!s_check_rem_and_log(s, 4 * device_count,
+ "Parsing [MS-RDPEFS] DR_DEVICELIST_REMOVE list"))
+ {
+ return -1;
+ }
LOG_DEVEL(LOG_LEVEL_DEBUG, "num of devices removed: %d", device_count);
{
@@ -901,9 +958,10 @@ devredir_proc_client_devlist_remove_req(struct stream *s)
xfuse_delete_share(device_id);
}
}
+ return 0;
}
-static void
+static int
devredir_proc_device_iocompletion(struct stream *s)
{
IRP *irp = NULL;
@@ -914,6 +972,10 @@ devredir_proc_device_iocompletion(struct stream *s)
tui32 Length;
enum COMPLETION_TYPE comp_type;
+ if (!s_check_rem_and_log(s, 12, "Parsing [MS-RDPEFS] DR_DEVICE_IOCOMPLETION"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, DeviceId);
xstream_rd_u32_le(s, CompletionId);
xstream_rd_u32_le(s, IoStatus32);
@@ -959,6 +1021,10 @@ devredir_proc_device_iocompletion(struct stream *s)
}
else
{
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CREATE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, irp->FileId);
devredir_send_drive_dir_request(irp, DeviceId,
1, irp->pathname);
@@ -966,6 +1032,10 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_CREATE_REQ:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CREATE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, irp->FileId);
xfuse_devredir_cb_create_file(
@@ -978,6 +1048,10 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_OPEN_REQ:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CREATE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, irp->FileId);
xfuse_devredir_cb_open_file((struct state_open *) irp->fuse_info,
@@ -989,7 +1063,15 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_READ:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_READ_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, Length);
+ if (!s_check_rem_and_log(s, Length, "Parsing [MS-RDPEFS] DR_READ_RSP"))
+ {
+ return -1;
+ }
xfuse_devredir_cb_read_file((struct state_read *) irp->fuse_info,
IoStatus,
s->p, Length);
@@ -997,6 +1079,10 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_WRITE:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_WRITE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, Length);
xfuse_devredir_cb_write_file((struct state_write *) irp->fuse_info,
IoStatus,
@@ -1019,6 +1105,10 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_RMDIR_OR_FILE:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CREATE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, irp->FileId);
devredir_proc_cid_rmdir_or_file(irp, IoStatus);
break;
@@ -1028,6 +1118,10 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
case CID_RENAME_FILE:
+ if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPEFS] DR_CREATE_RSP"))
+ {
+ return -1;
+ }
xstream_rd_u32_le(s, irp->FileId);
devredir_proc_cid_rename_file(irp, IoStatus);
break;
@@ -1051,6 +1145,7 @@ devredir_proc_device_iocompletion(struct stream *s)
break;
}
}
+ return 0;
}
static void
--
2.39.0
