SB2017060813 - Multiple vulnerabilities in Undertow

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Denial of service (CVE-ID: CVE-2017-2670)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when closing TCP sockets in Undertow. A remote attacker can create and close multiple TCP connections, which my result in infinite loop and server crash.

2) HTTP response splitting (CVE-ID: CVE-2017-2666)

The vulnerability allows a remote attacker to perform a phishing attack

The vulnerability exists due to an error when processing headers in HTTP requests in Undertow. A remote attacker can create a specially crafted HTTP request, split the HTTP response from server and poison the web cache. 

Successful exploitation of the vulnerability may allow an attacker to poison web cache and perform phishing or XSS attacks against website visitors.

Remediation

Install update from vendor's website.

References

• https://access.redhat.com/security/cve/cve-2017-2670
• https://access.redhat.com/security/cve/cve-2017-2666