Arch Linux update for polkit
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-4034 CVE-2021-4115 |
| CWE-ID | CWE-20 CWE-400 |
| Exploitation vector | Local |
| Public exploit |
Vulnerability #1 is being exploited in the wild. Public exploit code for vulnerability #2 is available. |
| Vulnerable software |
Arch Linux Operating systems & Components / Operating system |
| Vendor | Arch Linux |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Input validation error
EUVDB-ID: #VU60007
Risk: Medium
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:Green]
CVE-ID: CVE-2021-4034
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper handling of the calling parameters count in the pkexec setuid binary, which causes the binary to execute environment variables as commands. A local user can craft environment variables in a way that they will be processed and executed by pkexec and execute arbitrary commands on the system as root.
Update the affected package polkit to version 0.120-5.
Vulnerable software versionsArch Linux: All versions
CPE2.3 External linkshttps://security.archlinux.org/advisory/ASA-202204-2
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) Resource exhaustion
EUVDB-ID: #VU61268
Risk: Low
CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2021-4115
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: No
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to process file descriptor exhaustion in polkit. A local user can perform a denial of service (DoS) attack.
Update the affected package polkit to version 0.120-5.
Vulnerable software versionsArch Linux: All versions
CPE2.3 External linkshttps://security.archlinux.org/advisory/ASA-202204-2
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. However, proof of concept for this vulnerability is available.
