Amazon Linux AMI update for openssh

Published: 2023-08-23 | Updated: 2024-07-12

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2016-10009 CVE-2023-38408
CWE-ID	CWE-20 CWE-426
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available.
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU2015

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2016-10009

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on vulnerable ssh client.

The vulnerability exists due to incorrect handling of data passed to PKCS#11 module within ssh-agent. A remote attacker with control over sshd service can execute arbitrary code on vulnerable client.

Successful exploitation of this vulnerability may allow a remote attacker to execute arbitrary code on vulnerable client system but requires that client is connected to malicious SSH server.

Mitigation

Update the affected packages:

i686:
    openssh-ldap-7.4p1-22.80.amzn1.i686
    openssh-cavs-7.4p1-22.80.amzn1.i686
    openssh-server-7.4p1-22.80.amzn1.i686
    openssh-clients-7.4p1-22.80.amzn1.i686
    pam_ssh_agent_auth-0.10.3-2.22.80.amzn1.i686
    openssh-7.4p1-22.80.amzn1.i686
    openssh-keycat-7.4p1-22.80.amzn1.i686
    openssh-debuginfo-7.4p1-22.80.amzn1.i686

src:
    openssh-7.4p1-22.80.amzn1.src

x86_64:
    pam_ssh_agent_auth-0.10.3-2.22.80.amzn1.x86_64
    openssh-7.4p1-22.80.amzn1.x86_64
    openssh-debuginfo-7.4p1-22.80.amzn1.x86_64
    openssh-clients-7.4p1-22.80.amzn1.x86_64
    openssh-keycat-7.4p1-22.80.amzn1.x86_64
    openssh-cavs-7.4p1-22.80.amzn1.x86_64
    openssh-ldap-7.4p1-22.80.amzn1.x86_64
    openssh-server-7.4p1-22.80.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2023-1802.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. However, proof of concept for this vulnerability is available.

2) Untrusted search path

EUVDB-ID: #VU78454

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-38408

CWE-ID: CWE-426 - Untrusted Search Path