SB2022031120 - Anolis OS update for kernel

Description

This security bulletin contains information about 8 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2021-0920)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the unix_scm_to_skb() function of af_unix.c in Linux kernel. A local user can run a specially crafted program to trigger a race condition and execute arbitrary code with elevated privileges.

2) Use-after-free (CVE-ID: CVE-2021-4154)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the cgroup1_parse_param() function in kernel/cgroup/cgroup-v1.c in Linux kernel's cgroup v1 parser. A local user can execute arbitrary code via the fsconfig syscall parameter leading to a container breakout.

3) Buffer overflow (CVE-ID: CVE-2022-0330)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a random memory access flaw caused by a missing TLB flush in Linux kernel GPU i915 kernel driver functionality. A local user can execute arbitrary code on the system with elevated privileges.

4) Stack-based buffer overflow (CVE-ID: CVE-2022-0435)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the Linux kernel networking module for the Transparent Inter-Process Communication (TIPC) protocol. A remote unauthenticated attacker can send specially crafted traffic to the system, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the TIPC bearer is set up.

5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-0492)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a logic error within the cgroup_release_agent_write() function in  kernel/cgroup/cgroup-v1.c. A local user can use the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation.

6) Out-of-bounds write (CVE-ID: CVE-2022-0516)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in kvm_s390_guest_sida_op() function in the arch/s390/kvm/kvm-s390.c in KVM for s390 in the Linux kernel. A local user can trigger an out-of-bounds write and escalate privileges on the system.

7) Use of uninitialized resource (CVE-ID: CVE-2022-0847)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to usage of an uninitialized resources. A local user can overwrite arbitrary file in the page cache, even if the file is read-only, and execute arbitrary code on the system with elevated privileges.

The vulnerability was dubbed Dirty Pipe.

8) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-22942)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an error in the vmwgfx driver in Linux kernel. A local unprivileged user can gain access to files opened by other processes on the system through a dangling 'file' pointer.

Exploiting this vulnerability requires an attacker to have access to either /dev/dri/card0 or /dev/dri/rendererD128 and be able to issue an ioctl() on the resulting file descriptor.

Remediation

Install update from vendor's website.

References

• https://anas.openanolis.cn/errata/detail/ANSA-2022:0050