Privilege escalation in Linux Kernel

1) Memory corruption

EUVDB-ID: #VU15433

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-18445

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists in the adjust_scalar_min_max_vals function, as defined in the kernel/bpf/verifier.c source code file due to boundary error in the BPF verifier. A local attacker can trigger the BPF verifier to mishandle 32-bit right shifts and cause an out-of-bounds memory access condition to access sensitive information, escalate privileges, or cause a DoS condition on the targeted system.

Mitigation

Update to version 4.18.13.

Vulnerable software versions

Linux kernel: 4.4.150 - 4.18.12

External links

http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.13

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.