Privilege escalation in Xen
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-28703 |
| CWE-ID | CWE-264 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Xen Server applications / Virtualization software |
| Vendor | Xen Project |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU58343
Risk: Medium
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-28703
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated attacker to escalate privileges on the system.
The vulnerability exists due to grant table v2 status pages may remain accessible after de-allocation, which leads to security restrictions bypass and privilege escalation.
MitigationInstall updates from vendor's website.
Vulnerable software versionsXen: 2.0 - 25588
External linkshttp://xenbits.xen.org/xsa/advisory-387.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
