Amazon Linux AMI update for telnet

1) Buffer overflow

EUVDB-ID: #VU26625

Risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-10188

CWE-ID: CWE-119 - Memory corruption

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

Update the affected packages:

i686:
    telnet-0.17-49.9.amzn1.i686
    telnet-server-0.17-49.9.amzn1.i686
    telnet-debuginfo-0.17-49.9.amzn1.i686

src:
    telnet-0.17-49.9.amzn1.src

x86_64:
    telnet-debuginfo-0.17-49.9.amzn1.x86_64
    telnet-server-0.17-49.9.amzn1.x86_64
    telnet-0.17-49.9.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1387.html

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.