Amazon Linux AMI update for screen



Published: 2021-04-07
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-26937
CWE ID CWE-88
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Advisory

This security advisory describes one high risk vulnerability.

1) Improper Neutralization of Argument Delimiters in a Command

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-26937

CWE-ID: CWE-88 - Argument Injection or Modification

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to incorrect processing of user-supplied data in the encoding.c file. A remote attacker can pass specially crafted UTF-8 character sequence to the GNU Screen application and perform a denial of service attack or execute arbitrary code on the system.

Mitigation

Update the affected packages:

i686:
    screen-debuginfo-4.0.3-19.7.amzn1.i686
    screen-4.0.3-19.7.amzn1.i686

src:
    screen-4.0.3-19.7.amzn1.src

x86_64:
    screen-debuginfo-4.0.3-19.7.amzn1.x86_64
    screen-4.0.3-19.7.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: 2017.03

CPE External links

https://alas.aws.amazon.com/ALAS-2021-1492.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.



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