openEuler 24.03 LTS SP1 update for openssh



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2025-26465
CVE-2025-26466
CWE-ID CWE-300
CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 openEuler
Operating systems & Components / Operating system

openssh-help
Operating systems & Components / Operating system package or component

pam_ssh_agent_auth
Operating systems & Components / Operating system package or component

openssh-server
Operating systems & Components / Operating system package or component

openssh-keycat
Operating systems & Components / Operating system package or component

openssh-debugsource
Operating systems & Components / Operating system package or component

openssh-debuginfo
Operating systems & Components / Operating system package or component

openssh-clients
Operating systems & Components / Operating system package or component

openssh-askpass
Operating systems & Components / Operating system package or component

openssh
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Man-in-the-Middle (MitM) attack

EUVDB-ID: #VU104035

Risk: Medium

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-26465

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to incorrect processing of user-supplied data in ssh(1). A remote attacker can perform server impersonation when VerifyHostKeyDNS enabled.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 24.03 LTS SP1

openssh-help: before 9.6p1-5

pam_ssh_agent_auth: before 0.10.4-4.5

openssh-server: before 9.6p1-5

openssh-keycat: before 9.6p1-5

openssh-debugsource: before 9.6p1-5

openssh-debuginfo: before 9.6p1-5

openssh-clients: before 9.6p1-5

openssh-askpass: before 9.6p1-5

openssh: before 9.6p1-5

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1314


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.

2) Input validation error

EUVDB-ID: #VU104034

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2025-26466

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input related to SSH2_MSG_PING handling in sshd(8). A remote attacker can send specially crafted packets to the server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 24.03 LTS SP1

openssh-help: before 9.6p1-5

pam_ssh_agent_auth: before 0.10.4-4.5

openssh-server: before 9.6p1-5

openssh-keycat: before 9.6p1-5

openssh-debugsource: before 9.6p1-5

openssh-debuginfo: before 9.6p1-5

openssh-clients: before 9.6p1-5

openssh-askpass: before 9.6p1-5

openssh: before 9.6p1-5

CPE2.3 External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1314


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.



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