CVE-2022-4283

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

Xephyr is an X server which has been implemented as an ordinary X application. It runs in a window just like other X applications,but it is an X server itself in which you can run other software. It is a very useful tool for developers who wish to test their applications without running them on their real X server. Unlike Xnest, Xephyr renders to an X image rather than relaying the X protocol, and therefore supports the newer X extensions like Render and Composite.

Security Fix(es):

A vulnerability was found in X.Org. This security flaw occurs because the handler for the XvdiSelectVideoNotify request may write to memory after it has been freed. This issue can lead to local privileges elevation on systems where the X se(CVE-2022-46342)

A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty request has a length-validation issues, resulting in out-of-bounds memory reads and potential information disclosure. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.(CVE-2022-46344)

A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions. This issue does not affect systems where client and server use the same byte order.(CVE-2022-46340)

A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIPassiveUngrab request accesses out-of-bounds memory when invoked with a high keycode or button code. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.(CVE-2022-46341)

A vulnerability was found in X.Org. This security flaw occurs because the handler for the ScreenSaverSetAttributes request may write to memory after it has been freed. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.(CVE-2022-46343)

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.(CVE-2022-4283)

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

Security Fix(es):

• xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)
• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)
• xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)
• xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Xwayland is an X server for running X clients under Wayland.

Security Fix(es):

• xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)
• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)
• xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)
• xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

Security Fix(es):

• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Xwayland is an X server for running X clients under Wayland.

Security Fix(es):

• xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)
• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)
• xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)
• xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

Security Fix(es):

• xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)
• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)
• xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)
• xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

Security Fix(es):

• xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)
• xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)
• xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)
• xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)
• xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)
• xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

X.Org Server XkbGetKbdByName use-after-free. (CVE-2022-4283)

X.Org Server XTestSwapFakeInput stack overflow. (CVE-2022-46340)

X.Org Server XIPassiveUngrab out-of-bounds access. (CVE-2022-46341)

X.Org Server XvdiSelectVideoNotify use-after-free. (CVE-2022-46342)

X.Org Server ScreenSaverSetAttributes use-after-free. (CVE-2022-46343)

X.Org Server XIChangeProperty out-of-bounds access. (CVE-2022-46344)

These are all security issues fixed in the xorg-x11-server-21.1.4-6.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the xwayland-22.1.5-2.1 package on the GA media of openSUSE Tumbleweed.

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xorg-x11-server fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)
• Xi: return an error from XI property changes if verification failed (bsc#1205875)

This update for xwayland fixes the following issues:

• CVE-2022-46340: Server XTestSwapFakeInput stack overflow (bsc#1205874)
• CVE-2022-46342: Server XvdiSelectVideoNotify use-after-free (bsc#1205879)
• CVE-2022-46344: Server XIChangeProperty out-of-bounds access (bsc#1205876)
• CVE-2022-46343: Server ScreenSaverSetAttributes use-after-free (bsc#1205878)
• CVE-2022-46341: Server XIPassiveUngrabDevice out-of-bounds access (bsc#1205877)
• CVE-2022-4283: Reset the radio_groups pointer to NULL after freeing it (bsc#1206017)

Jan-Niklas Sohn discovered that X.Org X Server extensions contained multiple security issues. An attacker could possibly use these issues to cause the X Server to crash, execute arbitrary code, or escalate privileges.

USN-5778-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Jan-Niklas Sohn discovered that X.Org X Server extensions contained multiple security issues. An attacker could possibly use these issues to cause the X Server to crash, execute arbitrary code, or escalate privileges.