openEuler 22.03 LTS SP4 update for openssh

1) Race condition

EUVDB-ID: #VU94522

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2024-6409

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in portable version of sshd when handling signals. If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. A remote non-authenticated attacker can send a series of requests in order to trigger a race condition and execute arbitrary code on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 22.03 LTS SP4

openssh-help: before 8.8p1-32

pam_ssh_agent_auth: before 0.10.4-4.32

openssh-server: before 8.8p1-32

openssh-keycat: before 8.8p1-32

openssh-debugsource: before 8.8p1-32

openssh-debuginfo: before 8.8p1-32

openssh-clients: before 8.8p1-32

openssh-askpass: before 8.8p1-32

openssh: before 8.8p1-32

CPE2.3

• cpe:2.3:o:openeuler:openeuler:22.03:LTS SP4:*:*:*:*:*:*
• cpe:2.3:a:openeuler:openssh-help:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:pam_ssh_agent_auth:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-server:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-keycat:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-debugsource:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-debuginfo:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-clients:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh-askpass:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:openssh:*:*:*:*:*:openeuler:*:*

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2024-1872

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.