oss-security - Re: CVE-2018-8023: A remote attacker can exploit a vulnerability in the JWT implementation to gain unauthenticated access to Mesos Executor HTTP API.

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Message-ID: <CAGqxZSVqxSd27nWYFgicNVVMD8z=WXGZohsyX5xJ-Hh8p1643g@mail.gmail.com>
Date: Mon, 24 Sep 2018 09:36:51 +0800
From: Terry Chia <terrycwk1994@...il.com>
To: Ariel Zelivansky <ariel.zelivans@...il.com>
Cc: oss-security@...ts.openwall.com, Alex R <alexr@...che.org>
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.

Hi Ariel,

I believe the following commit contains the fix:
https://github.com/apache/mesos/commit/2c282f19755ea7518caf6f43e729524b1c6bdb23

Cheers,
Terry

On Sun, Sep 23, 2018 at 12:46 AM Ariel Zelivansky <ariel.zelivans@...il.com>
wrote:

> Hi,
>
> 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
> commit/patch?
>
> Thanks
> Ariel
>
> On Fri, Sep 21, 2018 at 1:50 PM, Alex R <alexr@...che.org> 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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