ZyXEL Prestige routers, including P-660, P-661, and P-662 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), allow remote authenticated users to obtain authentication data by making direct HTTP requests and then reading the HTML source, as demonstrated by a request for (1) RemMagSNMP.html, which discloses SNMP communities; or (2) WLAN.html, which discloses WEP keys.

References

• https://nvd.nist.gov/vuln/detail/CVE-2008-1528
• https://exchange.xforce.ibmcloud.com/vulnerabilities/41511
• http://www.procheckup.com/Hacking_ZyXEL_Gateways.pdf
• http://www.securityfocus.com/archive/1/489009/100/0/threaded
• http://www.gnucitizen.org/projects/router-hacking-challenge