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: <CAE-_4r3t0=fss0PSo9cSOVW3s4mXbJMnz5-WpY4MJifFFeDwgg@mail.gmail.com>
Date: Tue, 25 Sep 2018 20:24:42 +0300
From: Ariel Zelivansky <ariel.zelivans@...il.com>
To: Terry Chia <terrycwk1994@...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.

Thanks for following up with this

On Mon, Sep 24, 2018 at 4:36 AM, Terry Chia <terrycwk1994@...il.com> wrote:
> 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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