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Date: Sat, 22 Sep 2018 19:46:45 +0300
From: Ariel Zelivansky <>
Cc: Terry Chia <>
Subject: Re: CVE-2018-8023: A remote attacker can exploit a
 vulnerability in the JWT implementation to gain unauthenticated access to
 Mesos Executor HTTP API.


I couldn't find the fix for this in the mesos repository and it is not
documented in the CHANGELOG, could someone direct me to the fixing


On Fri, Sep 21, 2018 at 1:50 PM, Alex R <> wrote:
> Severity: Important
> Vendor:
> The Apache Software Foundation
> Versions Affected:
> Apache Mesos 1.4.0 to 1.6.0
> The unsupported Apache Mesos pre-1.4.0 releases may be also affected.
> Description:
> Apache Mesos can be configured to require authentication to call the
> Executor HTTP API using JSON Web Token (JWT). The comparison of the
> generated HMAC value against the provided signature in the JWT
> implementation used is vulnerable to a timing attack because instead
> of a constant-time string comparison routine a standard `==` operator
> has been used. A malicious actor can therefore abuse the timing
> difference of when the JWT validation function returns to reveal the
> correct HMAC value.
> Mitigation:
> pre-1.4.x users should upgrade to at least 1.4.2
> 1.4.x users should upgrade to 1.4.2
> 1.5.x users should upgrade to 1.5.2
> 1.6.0 users should upgrade to 1.6.1
> 1.7.0-dev users should obtain Mesos 1.7.0
> Credit:
> This issue was discovered by Terry Chia (Ayrx).
> Alex on behalf of Mesos PMC

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