Risk | Low |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2021-29951 |
CWE-ID | CWE-264 |
Exploitation vector | Local |
Public exploit | N/A |
Vulnerable software Subscribe |
Firefox ESR Client/Desktop applications / Web browsers |
Vendor | Mozilla |
Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU52852
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-29951
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to the way Mozilla Maintenance Service is installed in the Windows operating system. After installation the Mozilla Maintenance Service is granted SERVICE_START access to BUILTIN|Users
which, in a domain network, grants normal remote users access to start or stop the service. A local domain user can spam the "Stop" command and prevent the browser update service from operating.
The vulnerability affects only Firefox ESR installed on operating system Windows 10 build 1709 and older.
Install updates from vendor's website.
Vulnerable software versionsFirefox ESR: 78.0 - 78.10.0
External linkshttp://www.mozilla.org/en-US/security/advisories/mfsa2021-18/
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.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.