Red Hat Enterprise MRG 2 update for kernel-rt

1) Improper input validation

EUVDB-ID: #VU12853

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1120

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a local user to cause DoS condition on the target system.

The weakness exists due to insufficient validation of user-supplied input. A local user can block any read() access to /proc/PID/cmdline by mmap()ing a FUSE file (Filesystem in Userspace) onto this process's command-line arguments, block pgrep, pidof, pkill, ps, and w, either forever (a denial of service), or for some controlled time (a synchronization tool for exploiting other vulnerabilities).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.rt56.144.el6rt - 3.10.0-693.72.1.rt56.672.el6rt

MRG Realtime: 2

CPE2.3

• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.72.1.rt56.672.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.71.2.rt56.670.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-693.67.1.rt56.665.el6rt:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:a:red_hat:mrg_realtime:2:*:*:*:*:*:*:

External links

http://access.redhat.com/errata/RHSA-2020:3810

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.