CVE-2020-26124

published 2020-10-02

CVE-2020-26124: openmediavault before 4.1.36 and 5.x before 5.5.12 allows authenticated PHP code injection attacks, via the sortfield POST parameter of rpc.php, because…

Priority P1 78 high 8.8 CVSS 3.1

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

EXPLOIT

openmediavault before 4.1.36 and 5.x before 5.5.12 allows authenticated PHP code injection attacks, via the sortfield POST parameter of rpc.php, because json_encode_safe is not used in config/databasebackend.inc. Successful exploitation allows arbitrary command execution on the underlying operating system as root.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
openmediavault	openmediavault	< 4.1.36	4.1.36
openmediavault	openmediavault	>= 5.0.0 < 5.5.12	5.5.12

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

path /rpc.php↗

path config/databasebackend.inc↗

• → Monitor POST requests to rpc.php for suspicious or PHP-injectable content in the 'sortfield' parameter, which is the attack vector for CVE-2020-26124. ↗
• → Successful exploitation results in arbitrary command execution as root on the underlying OS; look for openmediavault web processes spawning unexpected child processes (e.g., shells) running as root. ↗
• → The exploit requires authentication; correlate suspicious rpc.php POST activity with prior successful login events to identify authenticated attacker sessions. ↗

• · Vulnerability affects openmediavault versions before 4.1.36 and all 5.x versions before 5.5.12; detections should be scoped to these version ranges. ↗

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 9.0 CRITICAL AV:N/AC:L/Au:S/C:C/I:C/A:C

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