Privilege escalation in Windows AppX Deployment Server
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2019-1253 CVE-2019-1303 |
| CWE-ID | CWE-119 |
| Exploitation vector | Local |
| Public exploit | Vulnerability #1 is being exploited in the wild. |
| Vulnerable software |
Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Buffer overflow
EUVDB-ID: #VU20995
Risk: Low
CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]
CVE-ID: CVE-2019-1253
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when the Windows AppX Deployment Server improperly handles junctions. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsWindows: 10 1703 10.0.15063.138 - 10 1903 10.0.18362.116
Windows Server: 2019 10.0.17763.1 - 2019 1903
CPE2.3- cpe:2.3:o:microsoft:windows:10_1703:10.0.15063.138:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1709:10.0.16299.19:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1803:10.0.17134.48:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1809:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1903:10.0.18362.116:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019_1803:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019_1903:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1253
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?
Yes. This vulnerability is being exploited in the wild.
2) Buffer overflow
EUVDB-ID: #VU20996
Risk: Low
CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2019-1303
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when the Windows AppX Deployment Server improperly handles junctions. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsWindows: 10 1703 10.0.15063.138 - 10 1903 10.0.18362.116
Windows Server: 2019 10.0.17763.1 - 2019 1903
CPE2.3- cpe:2.3:o:microsoft:windows:10_1703:10.0.15063.138:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1709:10.0.16299.19:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1803:10.0.17134.48:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1809:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows:10_1903:10.0.18362.116:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019_1803:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server:2019_1903:*:*:*:*:*:*:*
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1303
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.
