import tigervnc-1.12.0-9.el8_7.2
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From 947bd1b3f4a23565bf10879ec41ba06ebe1e1c76 Mon Sep 17 00:00:00 2001
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From: Olivier Fourdan <ofourdan@redhat.com>
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Date: Mon, 13 Mar 2023 11:08:47 +0100
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Subject: [PATCH xserver] composite: Fix use-after-free of the COW
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ZDI-CAN-19866/CVE-2023-1393
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If a client explicitly destroys the compositor overlay window (aka COW),
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we would leave a dangling pointer to that window in the CompScreen
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structure, which will trigger a use-after-free later.
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Make sure to clear the CompScreen pointer to the COW when the latter gets
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destroyed explicitly by the client.
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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: Olivier Fourdan <ofourdan@redhat.com>
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Reviewed-by: Adam Jackson <ajax@redhat.com>
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---
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composite/compwindow.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/composite/compwindow.c b/composite/compwindow.c
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index 4e2494b86..b30da589e 100644
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--- a/composite/compwindow.c
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+++ b/composite/compwindow.c
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@@ -620,6 +620,11 @@ compDestroyWindow(WindowPtr pWin)
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ret = (*pScreen->DestroyWindow) (pWin);
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cs->DestroyWindow = pScreen->DestroyWindow;
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pScreen->DestroyWindow = compDestroyWindow;
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+
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+ /* Did we just destroy the overlay window? */
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+ if (pWin == cs->pOverlayWin)
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+ cs->pOverlayWin = NULL;
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+
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/* compCheckTree (pWin->drawable.pScreen); can't check -- tree isn't good*/
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return ret;
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}
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--
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2.40.0
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@ -5,7 +5,7 @@
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Name: tigervnc
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Name: tigervnc
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Version: 1.12.0
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Version: 1.12.0
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Release: 9%{?dist}.3
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Release: 9%{?dist}.2
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Summary: A TigerVNC remote display system
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Summary: A TigerVNC remote display system
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%global _hardened_build 1
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%global _hardened_build 1
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@ -41,8 +41,6 @@ Patch101: 0001-rpath-hack.patch
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# CVE-2023-0494 tigervnc: xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation
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# CVE-2023-0494 tigervnc: xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation
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Patch110: xorg-x11-server-Xi-fix-potential-use-after-free-in-DeepCopyPointerCl.patch
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Patch110: xorg-x11-server-Xi-fix-potential-use-after-free-in-DeepCopyPointerCl.patch
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# CVE-2023-1393 tigervnc: xorg-x11-server: X.Org Server Overlay Window Use-After-Free Local Privilege Escalation Vulnerability
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Patch111: xorg-x11-server-composite-Fix-use-after-free-of-the-COW.patch
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BuildRequires: gcc-c++
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BuildRequires: gcc-c++
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BuildRequires: libX11-devel, automake, autoconf, libtool, gettext, gettext-autopoint
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BuildRequires: libX11-devel, automake, autoconf, libtool, gettext, gettext-autopoint
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@ -166,7 +164,6 @@ done
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%patch100 -p1 -b .xserver120-rebased
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%patch100 -p1 -b .xserver120-rebased
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%patch101 -p1 -b .rpath
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%patch101 -p1 -b .rpath
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%patch110 -p1 -b .Xi-fix-potential-use-after-free-in-DeepCopyPointerCl.patch
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%patch110 -p1 -b .Xi-fix-potential-use-after-free-in-DeepCopyPointerCl.patch
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%patch111 -p1 -b .composite-Fix-use-after-free-of-the-COW
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popd
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popd
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%patch1 -p1 -b .use-gnome-as-default-session
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%patch1 -p1 -b .use-gnome-as-default-session
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@ -333,10 +330,6 @@ fi
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%ghost %verify(not md5 size mtime) %{_sharedstatedir}/selinux/%{selinuxtype}/active/modules/200/%{modulename}
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%ghost %verify(not md5 size mtime) %{_sharedstatedir}/selinux/%{selinuxtype}/active/modules/200/%{modulename}
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%changelog
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%changelog
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*Mon Mar 27 2023 Jan Grulich <jgrulich@redhat.com> - 1.12.0-9.3
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- xorg-x11-server: X.Org Server Overlay Window Use-After-Free Local Privilege Escalation Vulnerability
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Resolves: bz#2180304
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* Wed Feb 15 2023 Jan Grulich <jgrulich@redhat.com> - 1.12.0-9.2
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* Wed Feb 15 2023 Jan Grulich <jgrulich@redhat.com> - 1.12.0-9.2
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- Add sanity check when cleaning up keymap changes
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- Add sanity check when cleaning up keymap changes
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Resolves: bz#2169962
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Resolves: bz#2169962
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