Multiple vulnerabilities in X.Org Server
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2021-4008 CVE-2021-4009 CVE-2021-4010 CVE-2021-4011 |
| CWE-ID | CWE-787 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
X.org Server Server applications / Other server solutions |
| Vendor | X.org |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU59045
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4008
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
Description The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SProcRenderCompositeGlyphs() function in the Render extension. A local user can send a specially crafted CompositeGlyphs request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
Vulnerable software versionsX.org Server: 1.20.0 - 21.1.1
External linkshttp://seclists.org/oss-sec/2021/q4/156
http://www.zerodayinitiative.com/advisories/ZDI-21-1547/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Out-of-bounds write
EUVDB-ID: #VU59046
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4009
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the ProcXFixesCreatePointerBarrier() function in the XFixes extension. A local user can send a specially crafted CreatePointerBarrier request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
Vulnerable software versionsX.org Server: 1.20.0 - 21.1.1
External linkshttp://seclists.org/oss-sec/2021/q4/156
http://www.zerodayinitiative.com/advisories/ZDI-21-1548/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Out-of-bounds write
EUVDB-ID: #VU59047
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4010
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SProcScreenSaverSuspend() function in the Screen Saver extension. A local user can send a specially crafted Suspend request, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
Vulnerable software versionsX.org Server: 1.20.0 - 21.1.1
External linkshttp://seclists.org/oss-sec/2021/q4/156
http://www.zerodayinitiative.com/advisories/ZDI-21-1549/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Out-of-bounds write
EUVDB-ID: #VU59048
Risk: Low
CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-4011
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the SwapCreateRegister() function in the Record extension. A local user can send a specially crafted RecordCreateContext and RecordRegisterClients requests, trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
Vulnerable software versionsX.org Server: 1.20.0 - 21.1.1
External linkshttp://seclists.org/oss-sec/2021/q4/156
http://www.zerodayinitiative.com/advisories/ZDI-21-1550/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
