CVE-2015-20122: Seeyon A6 SQL Injection Vulnerability

CVE-2015-20122 Overview

CVE-2015-20122 is an unauthenticated SQL injection vulnerability in the Seeyon A6 collaborative office automation (OA) platform. The flaw resides in the attach_ids parameter of the downloadAtt.jsp file attachment download endpoint. Remote attackers can inject UNION-based SQL statements to extract arbitrary database contents without authentication. Retrievable data includes user credentials and system configuration values. The Shadowserver Foundation first observed exploitation attempts on 2023-10-17, indicating active abuse in the wild against exposed installations.

Critical Impact
Unauthenticated remote attackers can extract credentials and sensitive configuration data from the Seeyon A6 database over the network, enabling full compromise of downstream systems that trust those credentials.

Affected Products

Seeyon A6 Collaborative Office Automation (OA) Platform
downloadAtt.jsp file attachment download endpoint
Deployments exposing the OA web interface to untrusted networks

Discovery Timeline

2023-10-17 - Exploitation activity first observed by the Shadowserver Foundation
2026-09-29 - CVE-2015-20122 published to NVD
2026-09-30 - Last updated in NVD database

Technical Details for CVE-2015-20122

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw [CWE-89] in the Seeyon A6 OA platform's attachment download handler. The downloadAtt.jsp endpoint accepts an attach_ids request parameter that is concatenated directly into a SQL query without parameterization or input validation. Because the endpoint does not enforce authentication, any network-reachable attacker can issue crafted requests.

Attackers use UNION-based injection payloads to append arbitrary SELECT statements to the original query. The response then leaks contents of arbitrary tables, including account tables holding credentials and configuration tables holding integration secrets. Successful extraction typically provides pivot material for lateral movement into connected systems.

Root Cause

The root cause is improper neutralization of special elements used in a SQL command. The attach_ids parameter flows from the HTTP request into a dynamically constructed SQL statement in downloadAtt.jsp. No prepared statement, allow-list validation, or type coercion is applied before execution.

Attack Vector

Exploitation requires only network access to the Seeyon A6 web interface. The attacker issues an HTTP request to downloadAtt.jsp with a malicious attach_ids value containing a UNION SELECT payload. The database engine executes the appended query and returns data in the download response. No user interaction, session token, or prior privilege is required.

Technical details and proof-of-concept references are available in the VulnCheck Advisory on SQL Injection, the Seebug VulDB #89642 entry, and the DDPoC PoC for DVB-2021-2211.

Detection Methods for CVE-2015-20122

Indicators of Compromise

HTTP requests to downloadAtt.jsp containing attach_ids values with SQL keywords such as UNION, SELECT, FROM, CONCAT, or hex-encoded equivalents.
Unusually large or repeated response payloads from the attachment download endpoint sourced from a single external IP.
Web server access logs showing downloadAtt.jsp requests from IP ranges reported by the Shadowserver Foundation feeds.

Detection Strategies

Deploy web application firewall (WAF) signatures that flag SQL metacharacters and UNION-based patterns in the attach_ids parameter.
Enable database query logging and alert on queries against credential or configuration tables originating from the OA application account.
Correlate authentication failures and successful logins across integrated systems with unauthenticated hits to downloadAtt.jsp.

Monitoring Recommendations

Continuously monitor perimeter-facing Seeyon A6 instances for anomalous request rates against /downloadAtt.jsp.
Forward web server, database, and application logs into a centralized SIEM for cross-source correlation and retention.
Subscribe to Shadowserver Foundation exploitation feeds and block source addresses observed scanning for this vulnerability.

How to Mitigate CVE-2015-20122

Immediate Actions Required

Restrict network access to the Seeyon A6 OA interface using firewall rules or a VPN, limiting exposure to trusted users only.
Deploy WAF rules that reject requests to downloadAtt.jsp where the attach_ids parameter contains non-numeric characters or SQL keywords.
Rotate credentials and integration secrets stored in the Seeyon A6 database if the instance has been exposed to the internet.
Review web and database logs for indicators dating back to 2023-10-17, the earliest observed exploitation date.

Patch Information

No vendor patch reference is included in the enriched CVE data. Operators should consult the vendor for the current supported Seeyon A6 release and confirm that the downloadAtt.jsp handler uses parameterized queries. Refer to the VulnCheck Advisory on SQL Injection for the most recent remediation guidance.

Workarounds

Block external access to /downloadAtt.jsp at the reverse proxy or WAF until a vendor-supplied fix is confirmed in place.
Enforce strict input validation at the reverse proxy, allowing only numeric or comma-separated numeric values in attach_ids.
Apply least-privilege database permissions to the OA application account, removing read access to tables that do not support attachment retrieval.

bash

# Example NGINX reverse proxy rule to block non-numeric attach_ids values
location /downloadAtt.jsp {
    if ($arg_attach_ids !~ "^[0-9,]+$") {
        return 403;
    }
    proxy_pass http://seeyon_backend;
}