CVE-2025-52689

published 2025-07-16

CVE-2025-52689: Successful exploitation of the vulnerability could allow an unauthenticated attacker to obtain a valid session ID with administrator privileges by spoofing the…

Priority P2 69 critical 9.8 CVSS 3.1

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

Successful exploitation of the vulnerability could allow an unauthenticated attacker to obtain a valid session ID with administrator privileges by spoofing the login request, potentially allowing the attacker to modify the behaviour of the access point.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
alcatel-lucent	omniaccess_stellar_products	—	—
alcatel-lucent	omniaccess_stellar_products	—	—
alcatel-lucent	omniaccess_stellar_products	—	—
alcatel-lucent	omniaccess_stellar_products	—	—
alcatel-lucent	omniaccess_stellar_products	—	—

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

url /echo.fcgi/api/login

other X-API-App-Id: hyapiinterface

other X-API-Timestamp: <10-digit epoch>

other X-API-Signature: <32 hex chars uppercase>

snort

alert http1 any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Alcatel-Lucent Authentication Bypass Attempt (CVE-2025-52689)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:20; content:"/echo.fcgi/api/login"; fast_pattern; http.header; content:"X-API-App-Id|3a 20|hyapiinterface"; content:"X-API-Timestamp|3a 20|"; pcre:"/^\d{10}/R"; content:"X-API-Signature|3a 20|"; pcre:"/^[A-F0-9]{32}/R"; reference:url,github.com/UltimateHG/CVE-2025-52689-PoC; reference:cve,2025-52689; classtype:web-application-attack; sid:2063533; rev:1; metadata:affected_product Alcatel_Lucent, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_07_16, cve CVE_2025_52689, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_07_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

• → Exploit traffic is plaintext HTTP (not TLS); deploy detection at perimeter and internal network boundaries targeting inbound POST requests to Alcatel-Lucent access point management interfaces.
• → The attack spoofs a login request via HTTP POST to the exact URI '/echo.fcgi/api/login' (URI length is exactly 20 bytes); alert on this precise URI length combined with the POST method.
• → Forged requests carry the fixed header 'X-API-App-Id: hyapiinterface'; presence of this header in a login POST is a strong indicator of exploitation.
• → Forged requests include an 'X-API-Timestamp' header with a 10-digit Unix epoch value and an 'X-API-Signature' header containing exactly 32 uppercase hex characters, consistent with a spoofed/computed HMAC-style signature.
• → Successful exploitation yields an unauthenticated attacker a valid administrator session ID; monitor for new privileged sessions on Alcatel-Lucent access points that are not preceded by a legitimate credential exchange. ↗
• → A public PoC is available at github.com/UltimateHG/CVE-2025-52689-PoC; expect low-sophistication exploitation attempts in the wild.

• · The Snort/Suricata rule (ET sid:2063533) uses 'http1' keyword, meaning it will only fire on cleartext HTTP traffic; encrypted HTTPS management interfaces will not be covered by this rule.
• · The URI match uses 'bsize:20' (exact buffer size), so any URL encoding, path prefix, or trailing slash variation would evade this specific signature.

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