SB2025120404 - Multiple vulnerabilities in Splunk Enterprise

Description

This security bulletin contains information about 5 vulnerabilities.

1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2025-20388)

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The disclosed vulnerability allows a user attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input. A remote privileged user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

2) Incorrect permission assignment for critical resource (CVE-ID: CVE-2025-20386)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due incorrect permissions assignment for Windows Installation directory (by default, C:\\Program Files\\Splunk) during new installation or upgrade. A local user on the machine can access the directory and all its contents.

3) Stored cross-site scripting (CVE-ID: CVE-2025-20385)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear

The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when processing the Anchor Tag "href" in Navigation Bar Collections. A remote privileged user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

4) Improper Output Neutralization for Logs (CVE-ID: CVE-2025-20384)

CWE-ID: CWE-117 - Improper Output Neutralization for Logs

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to manipulate application logs.

The vulnerability exists due to improper input validation at the "/en-US/static/" web endpoint. A remote non-authenticated attacker can inject American National Standards Institute (ANSI) escape codes into Splunk log files and manipulate their contents. 

5) Open redirect (CVE-ID: CVE-2025-20382)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote low-privileged user that does not hold the “admin” or “power” Splunk roles could create a views dashboard with a custom background using the data:image/png;base64 protocol that could potentially lead to an unvalidated redirect.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Remediation

Install update from vendor's website.

References

• https://advisory.splunk.com/advisories/SVD-2025-1207
• https://advisory.splunk.com/advisories/SVD-2025-1205
• https://advisory.splunk.com/advisories/SVD-2025-1204
• https://advisory.splunk.com/advisories/SVD-2025-1203
• https://advisory.splunk.com/advisories/SVD-2025-1201