SB2017051103 - Multiple vulnerabilities in Asus RT

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2017-6547)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability is caused by incorrect filtration of input data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim’s browser in security context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Session hijacking (CVE-ID: CVE-2017-6549)

The vulnerability allows a remote unauthenticated user to hijack any active admin session.

The weakness exists due to improper input validation. A remote attacker can send cgi_logout and asusrouter-Windows-IFTTT-1.0 in certain HTTP headers and gain the session cookies to hijack the valid user's session.

Successful exploitation of the vulnerability leads to session steal.

3) Stack-based buffer overflow (CVE-ID: CVE-2017-6548)

The vulnerability allows a remote unauthenticated user to execute arbitrary code on the target system.

The weakness exists due to stack-based buffer overflow. A remote attacker can send a specially crafted multicast messages containing a long host or port, trigger memory corruption, gain control over networkmap’s control flow and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability result in arbitrary code execution.

Remediation

Install update from vendor's website.

References

• https://bierbaumer.net/security/asuswrt/#cross-site-scripting-xss