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From f9c435822c852659e3926502829f1b13ce6efc37 Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Tue, 29 Nov 2022 13:26:57 +1000
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Subject: [PATCH xserver 3/7] Xi: avoid integer truncation in length check of
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ProcXIChangeProperty
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This fixes an OOB read and the resulting information disclosure.
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Length calculation for the request was clipped to a 32-bit integer. With
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the correct stuff->num_items value the expected request size was
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truncated, passing the REQUEST_FIXED_SIZE check.
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The server then proceeded with reading at least stuff->num_items bytes
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(depending on stuff->format) from the request and stuffing whatever it
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finds into the property. In the process it would also allocate at least
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stuff->num_items bytes, i.e. 4GB.
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The same bug exists in ProcChangeProperty and ProcXChangeDeviceProperty,
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so let's fix that too.
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CVE-2022-46344, ZDI-CAN 19405
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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Acked-by: Olivier Fourdan <ofourdan@redhat.com>
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---
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Xi/xiproperty.c | 4 ++--
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dix/property.c | 3 ++-
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2 files changed, 4 insertions(+), 3 deletions(-)
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diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
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index 68c362c628..066ba21fba 100644
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--- a/Xi/xiproperty.c
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+++ b/Xi/xiproperty.c
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@@ -890,7 +890,7 @@ ProcXChangeDeviceProperty(ClientPtr client)
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REQUEST(xChangeDevicePropertyReq);
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DeviceIntPtr dev;
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unsigned long len;
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- int totalSize;
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+ uint64_t totalSize;
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int rc;
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REQUEST_AT_LEAST_SIZE(xChangeDevicePropertyReq);
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@@ -1130,7 +1130,7 @@ ProcXIChangeProperty(ClientPtr client)
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{
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int rc;
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DeviceIntPtr dev;
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- int totalSize;
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+ uint64_t totalSize;
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unsigned long len;
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REQUEST(xXIChangePropertyReq);
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diff --git a/dix/property.c b/dix/property.c
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index 94ef5a0ec0..acce94b2c6 100644
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--- a/dix/property.c
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+++ b/dix/property.c
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@@ -205,7 +205,8 @@ ProcChangeProperty(ClientPtr client)
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WindowPtr pWin;
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char format, mode;
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unsigned long len;
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- int sizeInBytes, totalSize, err;
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+ int sizeInBytes, err;
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+ uint64_t totalSize;
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REQUEST(xChangePropertyReq);
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--
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2.38.1
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