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package/x11r7/xserver_xorg-server: add upstream security fixes for CVE-2022-355{0, 1}

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Fixes the following security issues:

- CVE-2022-3550: A vulnerability classified as critical was found in X.org
  Server.  Affected by this vulnerability is the function _GetCountedString
  of the file xkb/xkb.c.  The manipulation leads to buffer overflow.  It is
  recommended to apply a patch to fix this issue.  The associated identifier
  of this vulnerability is VDB-211051.

- CVE-2022-3551: A vulnerability, which was classified as problematic, has
  been found in X.org Server.  Affected by this issue is the function
  ProcXkbGetKbdByName of the file xkb/xkb.c.  The manipulation leads to
  memory leak.  It is recommended to apply a patch to fix this issue.  The
  identifier of this vulnerability is VDB-211052.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Peter Korsgaard 2022-12-11 12:09:07 +01:00 committed by Thomas Petazzoni
parent c34e0b1cd5
commit 66f3cc0b96
3 changed files with 102 additions and 0 deletions
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35
package/x11r7/xserver_xorg-server/0002-xkb-proof-GetCountedString-against-request-length-at.patch Normal file
View File

@ -0,0 +1,35 @@
From 11beef0b7f1ed290348e45618e5fa0d2bffcb72e Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 5 Jul 2022 12:06:20 +1000
Subject: [PATCH] xkb: proof GetCountedString against request length attacks
GetCountedString did a check for the whole string to be within the
request buffer but not for the initial 2 bytes that contain the length
field. A swapped client could send a malformed request to trigger a
swaps() on those bytes, writing into random memory.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
xkb/xkb.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/xkb/xkb.c b/xkb/xkb.c
index f42f59ef3..1841cff26 100644
--- a/xkb/xkb.c
+++ b/xkb/xkb.c
@@ -5137,6 +5137,11 @@ _GetCountedString(char **wire_inout, ClientPtr client, char **str)
CARD16 len;
wire = *wire_inout;
+
+ if (client->req_len <
+ bytes_to_int32(wire + 2 - (char *) client->requestBuffer))
+ return BadValue;
+
len = *(CARD16 *) wire;
if (client->swapped) {
swaps(&len);
--
2.30.2

60
package/x11r7/xserver_xorg-server/0003-xkb-fix-some-possible-memleaks-in-XkbGetKbdByName.patch Normal file
View File

@ -0,0 +1,60 @@
From 18f91b950e22c2a342a4fbc55e9ddf7534a707d2 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Wed, 13 Jul 2022 11:23:09 +1000
Subject: [PATCH] xkb: fix some possible memleaks in XkbGetKbdByName
GetComponentByName returns an allocated string, so let's free that if we
fail somewhere.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
xkb/xkb.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/xkb/xkb.c b/xkb/xkb.c
index 4692895db..b79a269e3 100644
--- a/xkb/xkb.c
+++ b/xkb/xkb.c
@@ -5935,18 +5935,32 @@ ProcXkbGetKbdByName(ClientPtr client)
xkb = dev->key->xkbInfo->desc;
status = Success;
str = (unsigned char *) &stuff[1];
- if (GetComponentSpec(&str, TRUE, &status)) /* keymap, unsupported */
- return BadMatch;
+ {
+ char *keymap = GetComponentSpec(&str, TRUE, &status); /* keymap, unsupported */
+ if (keymap) {
+ free(keymap);
+ return BadMatch;
+ }
+ }
names.keycodes = GetComponentSpec(&str, TRUE, &status);
names.types = GetComponentSpec(&str, TRUE, &status);
names.compat = GetComponentSpec(&str, TRUE, &status);
names.symbols = GetComponentSpec(&str, TRUE, &status);
names.geometry = GetComponentSpec(&str, TRUE, &status);
- if (status != Success)
+ if (status == Success) {
+ len = str - ((unsigned char *) stuff);
+ if ((XkbPaddedSize(len) / 4) != stuff->length)
+ status = BadLength;
+ }
+
+ if (status != Success) {
+ free(names.keycodes);
+ free(names.types);
+ free(names.compat);
+ free(names.symbols);
+ free(names.geometry);
return status;
- len = str - ((unsigned char *) stuff);
- if ((XkbPaddedSize(len) / 4) != stuff->length)
- return BadLength;
+ }
CHK_MASK_LEGAL(0x01, stuff->want, XkbGBN_AllComponentsMask);
CHK_MASK_LEGAL(0x02, stuff->need, XkbGBN_AllComponentsMask);
--
2.30.2

7
package/x11r7/xserver_xorg-server/xserver_xorg-server.mk
View File

@ -11,6 +11,13 @@ XSERVER_XORG_SERVER_LICENSE = MIT
XSERVER_XORG_SERVER_LICENSE_FILES = COPYING
XSERVER_XORG_SERVER_SELINUX_MODULES = xdg xserver
XSERVER_XORG_SERVER_INSTALL_STAGING = YES
# 0002-xkb-proof-GetCountedString-against-request-length-at.patch
XSERVER_XORG_SERVER_IGNORE_CVES += CVE-2022-3550
# 0003-xkb-fix-some-possible-memleaks-in-XkbGetKbdByName.patch
XSERVER_XORG_SERVER_IGNORE_CVES += CVE-2022-3551
XSERVER_XORG_SERVER_DEPENDENCIES = \
xutil_util-macros \
xlib_libX11 \