Category Archives: Advisories

CVE-2022-0324

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There is a vulnerability in DHCPv6 packet parsing code that could be explored by remote attacker to craft a packet that could cause buffer overflow in a memcpy call, leading to out-of-bounds memory write that would cause dhcp6relay to crash. Dhcp6relay is a critical process and could cause dhcp relay docker to shutdown. Discovered by Eugene Lim of GovTech Singapore.

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varnish-7.1.2-1.fc37 varnish-modules-0.20.0-4.fc37

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FEDORA-2022-0d5dcc031e

Packages in this update:

varnish-7.1.2-1.fc37
varnish-modules-0.20.0-4.fc37

Update description:

New upstream release: A security release. This release includes fix for CVE-2022-45059 (VSV00011) and CVE-2022-45060 (VSV00010). From the upstream release notes:

VSV00010 Varnish Request Smuggling Vulnerability

Date: 2022-11-08

A request smuggling attack can be performed on Varnish Cache servers by requesting that certain headers are made hop-by-hop, preventing the Varnish Cache servers from forwarding critical headers to the backend. Among the headers that can be filtered this way are both Content-Length and Host, making it possible for an attacker to both break the HTTP/1 protocol framing, and bypass request to host routing in VCL.

VSV00011 Varnish HTTP/2 Request Forgery Vulnerability

Date: 2022-11-08

A request forgery attack can be performed on Varnish Cache servers that have the HTTP/2 protocol turned on. An attacker may introduce characters through the HTTP/2 pseudo-headers that are invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1 requests to the backend. This may in turn be used to successfully exploit vulnerabilities in a server behind the Varnish server.

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