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CVE-2015-20122 – Unauthenticated SQL Injection – Seeyon A6 OA (all versions)

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Summary

CVE-2015-20122 is an unauthenticated SQL injection vulnerability in Seeyon (Yonyou) A6 OA, a collaborative office automation platform. The flaw resides in the attach_ids parameter of the downloadAtt.jsp attachment-download endpoint and allows remote, unauthenticated attackers to extract sensitive data from the backend database. The vulnerability carries a high severity rating and has been observed exploited in the wild.

Technical details

  • Root cause: downloadAtt.jsp fails to properly sanitize or parameterize the attach_ids request parameter before using it in a SQL query.
  • Trigger conditions: An attacker sends a crafted HTTP request to downloadAtt.jsp with a malicious attach_ids value; no authentication or user interaction is required.
  • Attack vector: Network-based, via UNION-based SQL injection payloads submitted as an HTTP request parameter.
  • Impact: Disclosure of sensitive data from the application database, including credentials and system configuration information. The vulnerability affects confidentiality only; integrity and availability are not impacted.
  • Exploitation status: Publicly available proof-of-concept exploit code exists, and exploitation attempts were first observed in the wild by the Shadowserver Foundation on October 17, 2023.

Affected software

  • Seeyon (Yonyou) A6 OA — all versions are listed as affected in the public advisory; no version-specific boundary has been published.

Severity

  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: No vendor-issued patched version has been publicly documented for this specific CVE. Contact the vendor for the latest available update or hotfix covering the downloadAtt.jsp SQL injection issue.
  • If no patch is available:
    • Restrict or disable public/internet-facing access to downloadAtt.jsp and other attachment-handling endpoints where feasible.
    • Deploy a web application firewall (WAF) rule to detect and block UNION-based SQL injection patterns targeting the attach_ids parameter.
    • Monitor logs for anomalous requests to downloadAtt.jsp containing SQL keywords (e.g., UNION, SELECT) in the attach_ids parameter.
    • Apply least-privilege database account permissions to limit the impact of any successful injection.
    • Isolate Seeyon A6 OA deployments from direct internet exposure and place them behind authenticated access controls where business requirements allow.

References

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