Denial of service in Linux Kernel

1) Race condition

EUVDB-ID: #VU13470

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-12633

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local attacker to obtain potentially sensitive information or cause DoS condition on the target system.

The vulnerability exists due to race condition when the vbg_misc_device_ioctl() function, as defined in the drivers/virt/vboxguest/vboxguest_linux.c source code file, allows user data to be read twice with the copy_from_userfunction. A local attacker can trigger a race condition, modify critical variables as hdr.size_in and hdr.size_out in the header, trigger a buffer over-access condition and access sensitive information or cause the system to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.15 - 4.17.2

External links

http://bugzilla.kernel.org/show_bug.cgi?id=200131

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.