CVE-2021-4008

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcRenderCompositeGlyphs function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcRenderCompositeGlyphs function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Xorg server common files.

Security Fix(es):

A security issue has been found in X.Org before version 21.1.2 and Xwayland before version 21.1.4. The handler for the CompositeGlyphs request of the Render extension does not properly validate the request length leading to out of bounds memory write. This 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-2021-4008)

A security issue has been found in X.Org before version 21.1.2 and Xwayland before version 21.1.4. The handler for the CreatePointerBarrier request of the XFixes extension does not properly validate the request length leading to out of bounds memory write. This 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-2021-4009)

A security issue has been found in X.Org before version 21.1.2 and Xwayland before version 21.1.4. The handler for the Suspend request of the Screen Saver extension does not properly validate the request length leading to an out of bounds memory write. This 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-2021-4010)

A security issue has been found in X.Org before version 21.1.2 and Xwayland before version 21.1.4. The handlers for the RecordCreateContext and RecordRegisterClients requests of the Record extension do not properly validate the request length leading to an out of bounds memory write. This 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-2021-4011)

Security Fix(es):

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcRenderCompositeGlyphs function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-4008)

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-4009)

A security issue has been found in X.Org before version 21.1.2 and Xwayland before version 21.1.4. The handler for the Suspend request of the Screen Saver extension does not properly validate the request length leading to an out of bounds memory write. This 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-2021-4010)

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-4011)

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.

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

The following packages have been upgraded to a later upstream version: xorg-x11-server-Xwayland (21.1.3). (BZ#2015842)

Security Fix(es):

• xorg-x11-server: SProcRenderCompositeGlyphs out-of-bounds access (CVE-2021-4008)

• xorg-x11-server: SProcXFixesCreatePointerBarrier out-of-bounds access (CVE-2021-4009)

• xorg-x11-server: SProcScreenSaverSuspend out-of-bounds access (CVE-2021-4010)

• xorg-x11-server: SwapCreateRegister out-of-bounds access (CVE-2021-4011)

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 Rocky Linux 8.6 Release Notes linked from the References section.

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcRenderCompositeGlyphs function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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.

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

The following packages have been upgraded to a later upstream version: xorg-x11-server-Xwayland (21.1.3). (BZ#2015842)

Security Fix(es):

• xorg-x11-server: SProcRenderCompositeGlyphs out-of-bounds access (CVE-2021-4008)

• xorg-x11-server: SProcXFixesCreatePointerBarrier out-of-bounds access (CVE-2021-4009)

• xorg-x11-server: SProcScreenSaverSuspend out-of-bounds access (CVE-2021-4010)

• xorg-x11-server: SwapCreateRegister out-of-bounds access (CVE-2021-4011)

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.

Updated x11-server packages fix security vulnerabilities:

The handler for the CompositeGlyphs request of the Render extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4008).

The handler for the CreatePointerBarrier request of the XFixes extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4009).

The handler for the Suspend request of the Screen Saver extension does not properly validate the request length leading to out of bounds memory write (CVE-2021-4010).

The handlers for the RecordCreateContext and RecordRegisterClients requests of the Record extension do not properly validate the request length leading to out of bounds memory write (CVE-2021-4011).

All of these issues 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 update for xorg-x11-server fixes the following issues:

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

These are all security issues fixed in the xorg-x11-server-21.1.2-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the xwayland-21.1.4-1.1 package on the GA media of openSUSE Tumbleweed.

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

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

• CVE-2021-4008: Fixed Privilege Escalation Vulnerability via Out-Of-Bounds Access in SProcRenderCompositeGlyphs (bsc#1193030).

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.

USN-5193-1 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 the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.

USN-5193-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.