Out-of-bounds write in Linux kernel

1) Out-of-bounds write

EUVDB-ID: #VU20858

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-2017-18551

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

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error in the "drivers/i2c/i2c-core-smbus.c" file when processing untrusted input. A local authenticated user access the system and execute an application that submits malicious input to the affected software, trigger an out-of-bounds write condition in the "i2c_smbus_xfer_emulated" function and execute arbitrary code or cause a DoS condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 4.14.0 - 4.14.14

External links

http://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.15
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=89c6efa61f5709327ecfa24bff18e57a4e80c7fa

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.