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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