SB2022012050 - Privilege escalation in Linux Kernel eBPF

Description

This security bulletin contains information about 1 vulnerability.

1) Security restrictions bypass (CVE-ID: CVE-2022-23222)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear

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

The vulnerability exists due to availability of pointer arithmetic via certain *_OR_NULL pointer types in kernel/bpf/verifier.c in the Linux kernel. A local user can run a specially crafted program to execute arbitrary code with root privileges.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://www.openwall.com/lists/oss-security/2022/01/13/1
• http://www.openwall.com/lists/oss-security/2022/01/14/1
• http://www.openwall.com/lists/oss-security/2022/01/18/2
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/bpf/verifier.c?h=v5.10.83#n6022