CVE-2024-32651

published 2024-04-26

CVE-2024-32651: changedetection.io is an open source web page change detection, website watcher, restock monitor and notification service. There is a Server Side Template…

Priority P1 85 critical 10 CVSS 3.1

AV N AC L PR N UI N S C C H I H A H

EXPLOIT

changedetection.io is an open source web page change detection, website watcher, restock monitor and notification service. There is a Server Side Template Injection (SSTI) in Jinja2 that allows Remote Command Execution on the server host. Attackers can run any system command without any restriction and they could use a reverse shell. The impact is critical as the attacker can completely takeover the server machine. This can be reduced if changedetection is behind a login page, but this isn't required by the application (not by default and not enforced).

Affected

2 ranges

Vendor	Product	Version range	Fixed in
dgtlmoon	changedetection.io	<= 0.45.20	—
dgtlmoon	changedetection.io	>= 0 < 0.45.21	0.45.21

Detection & IOCs extracted from sources · hover to see the quote

other compare_versions(version, '<= 0.45.20')

other html:"Change Detection"

sigma

Nuclei Template CVE-2024-32651: GET {{RootURL}}/ with xpath extractor on //*[@id="right-sticky"], match body word 'Change Detection', status 200, version <= 0.45.20

• → Vulnerable versions of changedetection.io are 0.45.20 and below; upgrade to 0.45.21 or later to remediate the SSTI RCE.
• → Identify exposed changedetection.io instances via Shodan using the query html:"Change Detection" as a pre-exploitation reconnaissance indicator.
• → The SSTI payload is injected via Jinja2 unsafe functions; monitor for template injection patterns (e.g., {{...}} or {%...%} in user-controlled inputs) reaching the changedetection.io application. ↗
• → Attackers can leverage the SSTI to spawn a reverse shell; monitor for unexpected outbound connections and shell process spawning from the changedetection.io process. ↗
• → The vulnerability is exploitable without authentication by default; prioritize detection on internet-facing changedetection.io deployments not protected by a login page. ↗
• → Detection probe: HTTP GET to the root path '/' of a changedetection.io instance; presence of 'Change Detection' in the response body combined with version <= 0.45.20 (extracted from XPath //*[@id="right-sticky"]) confirms a vulnerable target.

• · The EPSS score is extremely high (0.92455, 99.73rd percentile), indicating this vulnerability is very likely being actively exploited in the wild; treat as high-priority.
• · The vulnerability has a CVSS score of 10 (maximum) with network attack vector, no privileges required, and no user interaction; scope is changed with high impact on confidentiality, integrity, and availability.
• · Authentication is not enforced by default in changedetection.io; placing the application behind a login page reduces but does not eliminate risk. ↗

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