This security advisory describes one high risk vulnerability.

1) Buffer overflow

Severity: High

CVSSv3:
8.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2020-10188

CWE-ID:
CWE-119 – Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability:
No

Description

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

The vulnerability exists due to a boundary involving the netclear and nextitem functions within the utility.c in telnetd daemon from netkit telnet. A remote attacker can end specially crafted data to the telnetd daemon, trigger a boundary error and execute arbitrary code on the target system.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

Red Hat Enterprise Linux for Power, little endian:
7

Red Hat Enterprise Linux for Power, big endian:
7

Red Hat Enterprise Linux for IBM z Systems:
7

Red Hat Enterprise Linux for Scientific Computing:
7

Red Hat Enterprise Linux Desktop:
7

Red Hat Enterprise Linux Workstation:
7

Red Hat Enterprise Linux Server:
7

CPE
External links

https://access.redhat.com/errata/RHSA-2020:1334

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.





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