Red Hat update for kernel-rt

1) Man-in-the-middle attack

EUVDB-ID: #VU357

Risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2016-5696

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to write arbitrary files and cause DoS condition on the target system.

The weakness exists due to an error in net/ipv4/tcp_input.c while determining the rate of challenge ACK segments. A remote attacker can perform man-in-the-middle attack and hijack TCP sessions via a blind in-window attack.

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 - 3.10.0-327.28.2.rt56.234.el7_2

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

:

CPE2.3

• cpe:2.3:a:red_hat:kernel-rt_redhat_package:3.10.0-229.1.2.rt56.141.2.el7_1:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:kernel-rt_redhat_package:3.10.0-229.4.2.rt56.141.6.el7_1:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:kernel-rt_redhat_package:3.10.0-229.11.1.rt56.141.11.el7_1:*:*:*:*: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

https://access.redhat.com/errata/RHSA-2016:1632

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. However, proof of concept for this vulnerability is available.