SB2019091724 - Buffer overflow in OpenConnect VPN client

Description

This security bulletin contains information about 1 security vulnerability.

1) Buffer overflow (CVE-ID: CVE-2019-16239)

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

The vulnerability exists due to a boundary in the process_http_response when processing HTTP responses. A remote attacker that controls a malicious HTTP server can trick the victim to visit a malicious website, send an HTTP response with crafted chunk sizes for HTTP chunked encoding, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• http://lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.html
• https://t2.fi/schedule/2019/