NetScaler ADC and NetScaler Gateway update for OpenSSH

Published: 2024-07-11 | Updated: 2025-02-28

Risk	Critical
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2024-6387 CVE-2006-5051
CWE-ID	CWE-362
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software	Citrix Netscaler ADC Client/Desktop applications / Software for system administration Citrix NetScaler Gateway Server applications / Application servers
Vendor	Citrix

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Race condition

EUVDB-ID: #VU93513

Risk: High

CVSSv4.0: 8.2 [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:P/U:Amber]

CVE-ID: CVE-2024-6387

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

Exploit availability: Yes

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. 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 update from vendor's website.

Vulnerable software versions

Citrix Netscaler ADC: before 12.1-55.309

Citrix NetScaler Gateway: before 14.1-25.56

CPE2.3

External links

https://support.citrix.com/article/CTX678072

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) Race condition

EUVDB-ID: #VU93515

Risk: Critical

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red]

CVE-ID: CVE-2006-5051