GCVE-1988-2026-0137
Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-09 10:08
VLAI
EPSS
VEX
Title
[0day-rubbish] Leostream Connection Broker 9.1.37.0 two vulnerabilities (SQLi to root RCE, unauth SSRF)
Summary
0day Rubbish Research Team is publicly disclosing two vulnerabilities in Leostream Connection Broker 9.1.37.0.
Vulnerability 1 — Authenticated SQL injection to webshell to root RCE (CVSS 9.1,
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H, CWE-89)
call_back.pl?action=user concatenates the unsigned _where parameter into a PostgreSQL WHERE clause; the default
installation grants SUPERUSER, runs postgres as the webroot owner, and configures NOPASSWD sudo, so lo_export writes a
webshell and /welcome.pl?c= triggers commands as root.
Vulnerability 2 — Unauthenticated rogue-agent registration + SSRF (CVSS 7.0,
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, CWE-306)
Server.Register is dispatched without the session gate and its token check is optional, letting an anonymous caller
inject VM records and drive broker outbound TLS connections to attacker-controlled hosts.
Authentication: Vulnerability 1 authenticated (requires valid session); Vulnerability 2 unauthenticated / pre-auth.
Full technical analyses and reproducible proofs-of-concept:
https://0day-rubbish.com/blog/leostream-postauth-sqli-lo-export-webshell-rce
https://0day-rubbish.com/blog/leostream-unauth-server-register-ssrf
Project archive (ongoing disclosure series):
https://github.com/Exploit-Garbage/0day-Rubbish
Vendor has been notified. CVE IDs are pending.
--
0day Rubbish Research Team
disclosure () 0day-rubbish com
https://0day-rubbish.com
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Leostream | Leostream Connection Broker |
Affected:
unknown
|
guessed |
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Sightings
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Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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