Red Hat update for kernel-rt

1) Buffer overflow

EUVDB-ID: #VU21257

Risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14835

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a boundary error within the vhost/vhost_net Linux kernel module during the live migration flow when processing dirty log entries. A privileged guest user can pass descriptors with invalid length to the host when migration is on the way, trigger buffer overflow and execute arbitrary code on the host OS.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1062.1.1.rt56.1024.el7

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

:

CPE2.3

• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-1062.1.1.rt56.1024.el7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-957.27.2.rt56.940.el7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:kernel-rt_redhat_package:3.10.0-957.21.3.rt56.935.el7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time:7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_real_time_for_nfv:7:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:::::*:*:*:*:*:*:

External links

http://access.redhat.com/errata/RHSA-2019:2830

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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