Vigil@nce - varnish-modules: NULL pointer dereference via header.append/copy
May 2021 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulnerability
SYNTHESIS OF THE VULNERABILITY
– Impacted products: Varnish.
– Severity: 2/4.
– Consequences: denial of service on service, denial of service on
client.
– Provenance: internet client.
– Confidence: confirmed by the editor (5/5).
– Creation date: 16/03/2021.
DESCRIPTION OF THE VULNERABILITY
An attacker can force a NULL pointer to be dereferenced via
header.append/copy() of varnish-modules, in order to trigger a
denial of service.
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