CVE-2020-15492

published 2020-07-23

CVE-2020-15492: An issue was discovered in INNEO Startup TOOLS 2017 M021 12.0.66.3784 through 2018 M040 13.0.70.3804. The sut_srv.exe web application (served on TCP port 85)…

Priority P2 74 critical 9.8 CVSS 3.1

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

EXPLOIT

An issue was discovered in INNEO Startup TOOLS 2017 M021 12.0.66.3784 through 2018 M040 13.0.70.3804. The sut_srv.exe web application (served on TCP port 85) includes user input into a filesystem access without any further validation. This might allow an unauthenticated attacker to read files on the server via Directory Traversal, or possibly have unspecified other impact.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
inneo	startup_tools	12.0.66.3784 – 13.0.70.3804	—

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

process sut_srv.exe↗

path /../../../../../../../../../../↗

path PROGRA~2/stools↗

path software/LOG/sut_server_%s.log\0.php↗

command powershell.exe -exec bypass -EncodedCommand↗

• → Detect directory traversal attempts against TCP port 85 (sut_srv.exe) containing repeated '../' sequences — the exploit uses a traversal depth of at least 10 levels ('/../' × 10). ↗
• → Alert on HTTP GET requests to port 85 whose path contains a null-byte followed by '.php' (e.g., '.log\0.php'), indicating log-poisoning / LFI-to-RCE via PHP null-byte injection. ↗
• → Monitor for HTTP GET requests to port 85 targeting paths under 'software/LOG/' combined with traversal sequences, which indicates the attacker is attempting to include a poisoned log file for RCE. ↗
• → Detect child processes of sut_srv.exe spawning powershell.exe with '-exec bypass -EncodedCommand', which is the final RCE payload delivery mechanism. ↗

• · Affected versions are INNEO Startup TOOLS 2017 M021 12.0.66.3784 through 2018 M040 13.0.70.3804 only; detections scoped to TCP port 85 should be limited to hosts running sut_srv.exe in this version range to reduce false positives. ↗
• · The default install directory used in the exploit is 'PROGRA~2/stools'; detections referencing install paths should account for non-default installation directories. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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