Security update for pdns-recursor on trusty

[Scott Kitterman]

Note: We have this package running in production without any apparent issues.

  * SECURITY UPDATE:
  * References
  * CVE-2014-8601: PowerDNS Recursor before 3.6.2 does not limit delegation
    chaining, which allows remote attackers to cause a denial of service
    ("performance degradations") via a large or infinite number of referrals,
    as demonstrated by resolving domains hosted by ezdns.it.
    - Added debian/patches/CVE-2014-8601.patch
  * CVE-2015-1868: The label decompression functionality in PowerDNS Recursor
    3.5.x, 3.6.x before 3.6.3, and 3.7.x before 3.7.2 and Authoritative (Auth)
    Server 3.2.x, 3.3.x before 3.3.2, and 3.4.x before 3.4.4 allows remote
    attackers to cause a denial of service (CPU consumption or crash) via a
    request with a name that refers to itself.
    - Added debian/patches/CVE-2015-1868.patch
  * CVE-2015-5470: The label decompression functionality in PowerDNS Recursor
    before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth) Server before
    3.3.3 and 3.4.x before 3.4.5 allows remote attackers to cause a denial of
    service (CPU consumption or crash) via a request with a long name that
    refers to itself. NOTE: this vulnerability exists because of an incomplete
    fix for CVE-2015-1868.
    - Added debian/patches/CVE-2015-1868-2.patch
  * CVE-2016-7068: Florian Heinz and Martin Kluge reported that pdns-recursor
    parses all records present in a query regardless of whether they are
    needed or even legitimate, allowing a remote, unauthenticated attacker to
    cause an abnormal CPU usage load on the pdns server, resulting in a
    partial denial of service if the system becomes overloaded.
    - Added debian/patches/CVE-2016-7068.patch
  * Add debian/patches/qtypes.patch so qtypes required for CVE-2016-7068.patch
    are available

I have not evaluated any other Ubuntu releases (and don't intend to).

[Scott Kitterman (kitterman)]

debian/changelog will need the revision number adjusted to whatever you prefer and the bug number added.

[Emily Ratliff (emilyr)]

ACK

I updated the revision number and added dep headers to the patches that were lacking them.

It is now building in security-proposed. I've done some light testing and it seems to work for me, but the security team does not have standard regression tests for this package, so I would like to ask for some additional testing.

[Scott Kitterman (kitterman)]

Debian LTS uploaded essentially the same patch (we coordinated and reviewed
what each other had done). I'm not sure what to tell you about testing other
than that we have the change in production on a high volume system and haven't
seen any issues.

I'm no longer involved in Ubuntu development, but when I have clients that use
Ubuntu that I do work for, I do like to feed it back to the distro. I don't
know that I can help you further. It would be a shame for other Ubuntu users
to be left with the CVEs unfixed.

Scott K

On Tuesday, January 17, 2017 11:51:23 PM you wrote:
> ACK
>
> I updated the revision number and added dep headers to the patches that
> were lacking them.
>
> It is now building in security-proposed. I've done some light testing
> and it seems to work for me, but the security team does not have
> standard regression tests for this package, so I would like to ask for
> some additional testing.
>
> ** Changed in: pdns-recursor (Ubuntu Trusty)
> Status: Confirmed => In Progress
>
> ** Tags added: security-verification

[Emily Ratliff (emilyr)]

Your work on the debdiff is very much appreciated! Thanks for helping keep Ubuntu secure. The package has now been released.