Red Hat update for librelp

1) Stack-based buffer overflow

EUVDB-ID: #VU11306

Risk: High

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-1000140

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to execute arbitrary code on the target system.

The weakness exists in the relpTcpChkPeerName function due to insufficient validation of X.509 certificates and improper checks on the return value. A remote attacker can send a specially crafted X.509 certificate, trigger stack-based buffer overflow and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Power: 7.3

Red Hat Enterprise Linux for IBM z Systems: 7.3

Red Hat Enterprise Linux EUS Compute Node: 7.3

Red Hat Enterprise Linux Server: 7.3

CPE2.3

• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_power:7.3:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_for_ibm_z_systems:7.3:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_eus_compute_node:7.3:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:red_hat_enterprise_linux_server:7.3:*:*:*:*:red_hat_enterprise_linux:*:

External links

http://access.redhat.com/errata/RHSA-2018:1707

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?

Yes. This vulnerability is being exploited in the wild.