Vulnerability Note VU#525276
Philippine Long Distance Telephone SpeedSurf 504AN and Kasda KW58293 contain multiple vulnerabilities
Original Release date: 31 Aug 2015 | Last revised: 31 Aug 2015

Overview
The Phillipine Long Distance Telephone (PLDT) company provides internet access in the Phillippines. The SpeedSurf 504AN and Kasda KW58293 modems distributed by PLDT contains multiple vulnerabilities.

Description
PLDT provides SpeedSurf 504AN, firmware version GAN9.8U26-4-TX-R6B018-PH.EN, and the Kasda KW58293, to customers for internet access. These devices contains multiple vulnerabilities.
CWE-352: Cross-Site Request Forgery (CSRF) – CVE-2015-5991

The form2WlanSetup.cgi page does not properly authenticate that administrative actions are being performed on purpose. An attacker may lure a user behind the router to click a malicious link when performs administrative actions such as changing the device’s network settings.

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) – CVE-2015-5992

The form2WlanSetup.cgi page contains an "ssid" parameter which is vulnerable to cross-site scripting.

CWE-120: Buffer Copy without Checking Size of Input (‘Classic Buffer Overflow’) – CVE-2015-5993

The form2ping.cgi page may be used to send PING requests. An attacker may use this page to inject a large string (more than 1874 characters) in the parameter "ipaddr" with a POST request which may cause a denial of service on the router. The router requires manual rebooting to recover.

CWE-798: Use of Hard-coded Credentials

Both modems contain a hard-coded account named adminpldt with a hard-coded password. For more information, please see VU#950576.

The CVSS score below is based on CVE-2015-5991.

Impact
A remote attacker may utilize these credentials to gain administrator access to the device. A remote attacker may also be able to cause a denial of service.

Solution
The CERT/CC is currently unaware of a practical solution to this problem.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedPhilippine Long Distance TelephoneAffected02 Jun 201528 Aug 2015If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
7.4
AV:A/AC:M/Au:S/C:C/I:C/A:C

Temporal
6.3
E:POC/RL:U/RC:UR

Environmental
4.7
CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

None

Credit

Thanks to Eskie Cirrus James Maquilang for reporting this vulnerability to us.
This document was written by Garret Wassermann.

Other Information

CVE IDs:
CVE-2015-5991
CVE-2015-5992
CVE-2015-5993

Date Public:
31 Aug 2015

Date First Published:
31 Aug 2015

Date Last Updated:
31 Aug 2015

Document Revision:
47

FeedbackIf you have feedback, comments, or additional information about this vulnerability, please send us email.

Leave a Reply