Anolis OS update for kernel(ANCK)4.19
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-22555 CVE-2021-33909 |
| CWE-ID | CWE-787 CWE-190 |
| Exploitation vector | Local |
| Public exploit |
Vulnerability #1 is being exploited in the wild. Public exploit code for vulnerability #2 is available. |
| Vulnerable software |
Anolis OS Operating systems & Components / Operating system python3-perf Operating systems & Components / Operating system package or component perf Operating systems & Components / Operating system package or component kernel-tools-libs-devel Operating systems & Components / Operating system package or component kernel-tools-libs Operating systems & Components / Operating system package or component kernel-tools Operating systems & Components / Operating system package or component kernel-modules-extra Operating systems & Components / Operating system package or component kernel-modules Operating systems & Components / Operating system package or component kernel-headers Operating systems & Components / Operating system package or component kernel-devel Operating systems & Components / Operating system package or component kernel-debug-modules-extra Operating systems & Components / Operating system package or component kernel-debug-modules Operating systems & Components / Operating system package or component kernel-debug-devel Operating systems & Components / Operating system package or component kernel-debug-core Operating systems & Components / Operating system package or component kernel-debug Operating systems & Components / Operating system package or component kernel-core Operating systems & Components / Operating system package or component kernel Operating systems & Components / Operating system package or component bpftool Operating systems & Components / Operating system package or component |
| Vendor | OpenAnolis |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU56017
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-2021-22555
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
Description The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when processing untrusted input in net/netfilter/x_tables.c in Linux kernel. A local user can run a specially crafted program to trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
Install updates from vendor's repository.
Vulnerable software versionsAnolis OS: 8
python3-perf: before 4.19.91-24.9
perf: before 4.19.91-24.9
kernel-tools-libs-devel: before 4.19.91-24.9
kernel-tools-libs: before 4.19.91-24.9
kernel-tools: before 4.19.91-24.9
kernel-modules-extra: before 4.19.91-24.9
kernel-modules: before 4.19.91-24.9
kernel-headers: before 4.19.91-24.9
kernel-devel: before 4.19.91-24.9
kernel-debug-modules-extra: before 4.19.91-24.9
kernel-debug-modules: before 4.19.91-24.9
kernel-debug-devel: before 4.19.91-24.9
kernel-debug-core: before 4.19.91-24.9
kernel-debug: before 4.19.91-24.9
kernel-core: before 4.19.91-24.9
kernel: before 4.19.91-24.9
bpftool: before 4.19.91-24.9
CPE2.3- cpe:2.3:o:openanolis:anolis_os:8:*:*:*:*:*:*:*
- cpe:2.3:a:openanolis:python3-perf:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:perf:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools-libs-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools-libs:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-modules-extra:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-modules:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-headers:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-modules-extra:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-modules:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-core:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-core:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:bpftool:*:*:*:*:*:anolis_os:*:*
https://anas.openanolis.cn/errata/detail/ANSA-2021:0212
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) Integer overflow
EUVDB-ID: #VU55143
Risk: Low
CVSSv4.0: 7.1 [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:P/U:Clear]
CVE-ID: CVE-2021-33909
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer overflow during size_t-to-int conversion when creating, mounting, and deleting a deep directory structure whose total path length exceeds 1GB. An unprivileged local user can write up to 10-byte string to an offset of exactly -2GB-10B below the beginning of a vmalloc()ated kernel buffer.
Successful exploitation of vulnerability may allow an attacker to exploit the our-of-bounds write vulnerability to execute arbitrary code with root privileges.
Install updates from vendor's repository.
Vulnerable software versionsAnolis OS: 8
python3-perf: before 4.19.91-24.9
perf: before 4.19.91-24.9
kernel-tools-libs-devel: before 4.19.91-24.9
kernel-tools-libs: before 4.19.91-24.9
kernel-tools: before 4.19.91-24.9
kernel-modules-extra: before 4.19.91-24.9
kernel-modules: before 4.19.91-24.9
kernel-headers: before 4.19.91-24.9
kernel-devel: before 4.19.91-24.9
kernel-debug-modules-extra: before 4.19.91-24.9
kernel-debug-modules: before 4.19.91-24.9
kernel-debug-devel: before 4.19.91-24.9
kernel-debug-core: before 4.19.91-24.9
kernel-debug: before 4.19.91-24.9
kernel-core: before 4.19.91-24.9
kernel: before 4.19.91-24.9
bpftool: before 4.19.91-24.9
CPE2.3- cpe:2.3:o:openanolis:anolis_os:8:*:*:*:*:*:*:*
- cpe:2.3:a:openanolis:python3-perf:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:perf:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools-libs-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools-libs:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-tools:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-modules-extra:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-modules:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-headers:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-modules-extra:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-modules:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-devel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug-core:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-debug:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel-core:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:kernel:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:a:openanolis:bpftool:*:*:*:*:*:anolis_os:*:*
https://anas.openanolis.cn/errata/detail/ANSA-2021:0212
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.
