Re: apptainer 1.1.8-1 has an incompatible change for apptainer-suid users

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On Wed, Apr 26, 2023 at 11:31 AM Jonathan Wright via epel-devel
<epel-devel@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Dave (Dykstra),
>
> The process is pretty well laid out at https://docs.fedoraproject.org/en-US/epel/epel-policy-incompatible-upgrades/#process_for_incompatible_upgrades
>
> I think leaving the package in epel-testing for now is OK but you definitely need to hold it from release repos until the policy is followed and the necessary approvals are obtained from the EPEL steering committee.
>
> I can't currently find it in the docs but I think going ahead and opening an issue at https://pagure.io/epel/issues will help facilitate the process.  I'm quite sure that this is/was documented somewhere when submitted an incompatible update for approval a few months back.  You can see it at https://pagure.io/epel/issue/212 which might help make more sense of the process as well.

Creating an issue there isn't strictly required, but it's typically
the mechanism we use to accomplish step 3, adding it to the agenda for
the next committee meeting.

>
> On Wed, Apr 26, 2023 at 11:20 AM Dave Dykstra via epel-devel <epel-devel@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> DT is correct, this change is subject to the EPEL incompatible change
>> policy.  apptainer-suid-1.1.8 by default disables mounting of ext3
>> filesystems, because of CVE-2023-30549
>>     https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg
>> Most users don't use this feature, but a significant minority does.
>> Apptainer has a non-setuid alternative for the same functionality if
>> unprivileged user namespaces are available.
>>
>> The summary of the CVE is that the way that apptainer & singularity
>> allow mounts of ext3 filesystems in setuid mode raises the severity of
>> many ext4 filesystem CVEs (ext3 filesystems are implemented by the ext4
>> driver).  OS vendors consider those CVEs to be low or moderate priority
>> because they assume that users do not have write access to the
>> underlying bits of the filesystem, but apptainer/singularity setuid mode
>> gives that access to users by default (before this release of apptainer).
>> Since vendors don't see urgency to patch low/moderate CVEs, it can take
>> a very long time for them to patch them and in fact RHEL7 is not patched
>> for one in particular.  All this information came from a reliable source,
>> the owner of the ext4 kernel driver.
>>
>> I am sorry to see that I have already done one step too many according
>> to the incompatible changes policy, and have made the release available
>> to epel-testing.  However, I think it's important to make it available
>> that way for system administrators to install early.  The large High
>> Energy Physics community that I represent has security teams that want
>> to be able to notify their site administrators to upgrade to respond to
>> this high severity CVE, and it would be so much better if the
>> announcement they send can say to install from epel-testing rather than
>> having to provide URLs to download from koji.
>>
>> So, to the EPEL Steering Committee members: must I unpublish this update
>> from testing, or may I leave it there and send an announcement to
>> epel-announce that it is there and pending approval by the committee?
>> The bodhi settings are set so they won't get auto-updated by karma or
>> time.
>>
>> And another question: should I submit an epel ticket for this?  The
>> policy doesn't mention that.
>>
>> Dave
>>
>> On Wed, Apr 26, 2023 at 09:41:16AM +0100, David Trudgian wrote:
>> > Subject: Re: apptainer 1.1.8-1 appears to be an incompatible upgrade for apptainer-suid users
>> >
>> > Hello,
>> >
>> > The maintainer of the apptainer package has submitted updates to version 1.1.8-1 against epel-testing:
>> >
>> > https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-18a0e3fa23
>> > https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-44ff2475c4
>> > https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-b31211e2ce
>> >
>> > I believe that the update should be considered an incompatible upgrade, requiring the incompatible upgrades policy to be followed, as it significantly changes behaviour for users who have the apptainer-setuid sub-package installed.
>> >
>> > The update now disallows, by default, workflows that involve ext format container images and overlays:
>> >
>> > ```
>> > # Before update
>> > $ apptainer exec sif-overlay.sif /bin/date
>> > Wed Apr 26 09:12:37 BST 2023
>> >
>> > # Update to the testing package
>> > $ sudo dnf update --enablerepo=epel-testing apptainer-suid
>> >
>> > # After update
>> > $ apptainer exec sif-overlay.sif /bin/date
>> > FATAL:   configuration disallows users from mounting SIF extfs partition in setuid mode, try --userns
>> > ```
>> >
>> > I understand that the update is related to a security issue that upstream has published:
>> >
>> > CVE-2023-30549  - https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg
>> >
>> > However, I don't think this exempts the update from the incompatible upgrades policy?
>> >
>> > I'd also like to note that CVE-2023-30549 is dependent on and potentially a duplicate of CVE-2022-1184, which has been patched in EL8 and EL9, but admittedly not in EL7.
>> >
>> > Thanks,
>> >
>> > DT
>> >
>> >
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>
>
>
> --
> Jonathan Wright
> AlmaLinux Foundation
> Mattermost: chat
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-- 
Carl George
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