Out-of-bounds write in Linux kernel

1) Out-of-bounds write

EUVDB-ID: #VU13824

Risk: Low

CVSSv4.0: 5.9 [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:U/U:Clear]

CVE-ID: CVE-2018-10882

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to out-of-bounds write error in the fs/jbd2/transaction.csource code in the fourth extended filesystem (ext4). A local attacker can unmount a specially crafted ext4 filesystem image, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

The vulnerability has been fixed in the versions 4.4.140, 4.9.112, 4.14.55, 4.17.6.

Vulnerable software versions

Linux kernel: 4.4 - 4.17.5

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.4.139:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.111:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.17.5:*:*:*:*:*:*:*

External links

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.112
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.140
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.17.6
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.55

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.