Privilege escalation in Linux Kernel



Published: 2018-10-19
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2018-18445
CWE ID CWE-119
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Advisory

This security advisory describes one low risk vulnerability.

1) Memory corruption

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] [PCI]

CVE-ID: CVE-2018-18445

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

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, 4.4.151, 4.4.152, 4.4.153, 4.14.0, 4.14.0 rc1, 4.14.1, 4.14.2, 4.14.3, 4.14.4, 4.14.5, 4.14.6, 4.14.7, 4.14.8, 4.14.9, 4.14.10, 4.14.11, 4.14.12, 4.14.13, 4.14.14, 4.14.15, 4.14.16, 4.14.17, 4.14.18, 4.14.19, 4.14.20, 4.14.21, 4.14.22, 4.14.23, 4.14.24, 4.14.25, 4.14.26, 4.14.27, 4.14.28, 4.14.29, 4.14.30, 4.14.31, 4.14.32, 4.14.33, 4.14.34, 4.14.35, 4.14.36, 4.14.37, 4.14.38, 4.14.39, 4.14.40, 4.14.41, 4.14.42, 4.14.43, 4.14.44, 4.14.45, 4.14.46, 4.14.47, 4.14.48, 4.14.49, 4.14.50, 4.14.51, 4.14.52, 4.14.53, 4.14.54, 4.14.55, 4.14.56, 4.14.57, 4.14.58, 4.14.59, 4.14.60, 4.14.61, 4.14.62, 4.14.63, 4.14.64, 4.14.65, 4.14.66, 4.14.67, 4.14.68, 4.14.69, 4.14.70, 4.14.71, 4.14.72, 4.14.73, 4.14.74, 4.14.75, 4.14.76, 4.14.77, 4.15, 4.15 rc1, 4.15 rc2, 4.15 rc3, 4.15 rc4, 4.15.0 rc4, 4.15.0-r7, 4.15.1, 4.15.2, 4.15.3, 4.15.4, 4.15.5, 4.15.6, 4.15.7, 4.15.8, 4.15.9, 4.15.10, 4.15.11, 4.15.12, 4.15.13, 4.15.14, 4.15.15, 4.15.16, 4.15.17, 4.15.18, 4.16, 4.16 rc, 4.16 rc1, 4.16 rc2, 4.16 rc3, 4.16 rc4, 4.16 rc5, 4.16 rc6, 4.16 rc7, 4.16.1, 4.16.2, 4.16.3, 4.16.4, 4.16.5, 4.16.6, 4.16.7, 4.16.8, 4.16.9, 4.16.10, 4.16.11, 4.16.12, 4.16.13, 4.16.14, 4.16.15, 4.16.16, 4.16.17, 4.16.18, 4.17, 4.17.1, 4.17.2, 4.17.3, 4.17.4, 4.17.5, 4.17.6, 4.17.7, 4.17.8, 4.17.9, 4.17.10, 4.17.11, 4.17.12, 4.17.13, 4.17.14, 4.17.15, 4.17.16, 4.17.17, 4.17.18, 4.17.19, 4.18, 4.18.1, 4.18.2, 4.18.3, 4.18.4, 4.18.5, 4.18.6, 4.18.7, 4.18.8, 4.18.9, 4.18.10, 4.18.11, 4.18.12

CPE External links

https://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.



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