[MIR] Promote ruby-rack to main as a pcs indirect dependency

Bug #1990575 reported by Lucas Kanashiro
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ruby-rack (Ubuntu)
Fix Released

Bug Description


The package ruby-rack is already in Ubuntu universe.

The package ruby-rack build for the architectures it is designed to work on.

It currently builds and works for architectures: amd64 (arch:all)

Link to package [[https://launchpad.net/ubuntu/+source/ruby-rack|ruby-rack]]


The package ruby-rack is required in Ubuntu main for thin and ruby-sinatra
promotions which are runtime dependencies of pcs (the main reason for this

Ideally, we expect that ruby-rack (and pcs) will be promoted in the "L" development cycle. The idea is to promote only the ruby-rack binary.


Required links:


3 CVEs were found, one from 2018 and two from 2020.

Searching in the OSS security mailing list archive I found:



Reports 14 CVEs, all of them medium or low. In Kinetic, some of them still need investigation and others fixes.

No `suid` or `sgid` binaries.

No executables in `/sbin` and `/usr/sbin`.

Package does not install services, timers or recurring jobs.

Packages does not open privileged ports (ports < 1024).

Packages does not contain extensions to security-sensitive software
(filters, scanners, plugins, UI skins, ...).

[Quality assurance - function/usage]

The package works well right after install.

[Quality assurance - maintenance]

The package is maintained well in Debian/Ubuntu and has not too many
and long term critical bugs open

- Ubuntu https://bugs.launchpad.net/ubuntu/+source/ruby-rack/+bug
- Debian https://bugs.debian.org/cgi-bin/pkgreport.cgi?src=ruby-rack

The package does not deal with exotic hardware we cannot support.

[Quality assurance - testing]

The package runs a test suite on build time, if it fails
it makes the build fail, link to build log:


The package runs an autopkgtest, and is currently passing on
this list of architectures: amd64, arm64, armhf, ppc64el, s390x.

Link to test logs:


The package does have not failing autopkgtests right now. Only in i386, where some dependencies are not installable.

[Quality assurance - packaging]

debian/watch is present and works.

debian/control defines a correct Maintainer field.

Lintian overrides are not present. Here is the output of `lintian --pedantic` against Kinetic version:

W: ruby-rack source: newer-standards-version 4.6.1 (current is
P: ruby-rack source: maintainer-manual-page debian/rackup.1

This package does not rely on obsolete or about to be demoted packages.

The package will not be installed by default.

Packaging and build is easy, link to d/rules:


[UI standards]

Application is not end-user facing (does not need translation).


No further depends or recommends dependencies that are not yet in main.

[Standards compliance]

This package correctly follows FHS and Debian Policy.


Owning Team will be Server.

Team is not yet, but will subscribe to the package before promotion.

This does not use static builds.

This does not use vendored code.

This package is not rust based.

The package has been built in the archive more recently than the last
test rebuild.

[Background information]

The Package description explains the package well.

Upstream Name is: rack.

Link to upstream project: https://github.com/rack/rack

Tags: sec-1497
description: updated
Changed in ruby-rack (Ubuntu):
assignee: nobody → Lukas Märdian (slyon)
Revision history for this message
Lukas Märdian (slyon) wrote :
Download full text (5.6 KiB)

Review for Package: src:ruby-rack

Ruby rack is a popular middleware/framework for developing web applications,
using Ruby (not quite as popular as "Rails", though). It is well maintained
and I have not found another ruby based web framework in main.

MIR team ACK under the constraint to resolve the below listed
required TODOs and as much as possible having a look at the
recommended TODOs.

This does need a security review, so I'll assign ubuntu-security

List of specific binary packages to be promoted to main: ruby-rack
Specific binary packages built, but NOT to be promoted to main: <None>

This is a middleware, exposed to the public interwebs, parsing HTTP requests.
Also, it has a history of CVEs in addition to https://bugs.debian.org/946983
So I'm assigning ~ubuntu-security.

Required TODOs:
#0 current release NOT packaged, new major version 3.0.0 available as of 09/22

Recommended TODOs:
#1 The package should get a team bug subscriber (Server team) before being promoted
#2 Debian/Ubuntu update history is a bit slow, we should try to improve this moving forward (We have DDs as uploaders, so that should be fine)
#3 Lintian suggestion:
P: ruby-rack source: maintainer-manual-page [debian/rackup.1]
The maintainer keeps a manual page in ./debian. Please forward the manual
page upstream and ask them to include in their version control system, and
in their next release.

#4 three classes of warnings during build (see below for logs):
(1) should (xargs options) be fixed
(2) we probably can't do anything about it right now
(3) should be discussed with upstream

There is no other package in main providing the same functionality.

Rack seems to be a popular and well maintained Ruby middleware, but here are
other web frameworks for Ruby, notably src:rails which is even more popular.
None of those is currently in main, though.

- no other Dependencies to MIR due to this
  - SRCPKG checked with `check-mir`
  - all dependencies can be found in `seeded-in-ubuntu` (already in main)
  - none of the (potentially auto-generated) dependencies (Depends
    and Recommends) that are present after build are not in main
- no -dev/-debug/-doc packages that need exclusion
- No dependencies in main that are only superficially tested requiring
  more tests now.

Problems: None

[Embedded sources and static linking]
- no embedded source present
- no static linking
- does not have unexpected Built-Using entries
- not a go package, no extra constraints to consider in that regard
- not a rust package, no extra constraints to consider in that regard
- Does not include vendored code

Problems: None

- does not run a daemon as root
- does not use webkit1,2
- does not use lib*v8 directly
- does not use centralized online accounts
- does not integrate arbitrary javascript into the desktop
- does not deal with system authentication (eg, pam), etc)
- does not deal with security attestation (secure boot, tpm, signatures)
- does not deal with cryptography (en-/decryption, certificates, signing, ...)

- does parse data formats (network packets) fr...


Changed in ruby-rack (Ubuntu):
status: New → Confirmed
assignee: Lukas Märdian (slyon) → Ubuntu Security Team (ubuntu-security)
Revision history for this message
Lucas Kanashiro (lucaskanashiro) wrote :

Thanks for the review Lukas!

I have been working on the update to version 3.0.0 in Debian but it will take some time. This is a major version bump and there are some breaking changes, I'll be uploading it to experimental and call for testing before moving it to unstable (and then sync into Ubuntu). Moreover, the rackup command was extracted from ruby-rack in this new release, this change will require the inclusion of ruby-rackup in the archive. I already filed an ITP bug for that here:


FWIW I will be adding myself to the Uploaders list of both packages so we can more easily keep things updated.

Regarding forwarding the manpage to upstream, I do not think this is needed. TBH the manpage seems to be outdated, and it shouldn't be generated manually, we should generate it during build time. I'll try to sort this out in ruby-rackup (the new source package).

And about the warnings, I do not see most of them in the new version I am preparing right now, so I think they are already sorted out. The only one I see is the one related to the substvars but it says ${shlibs:Depends} is not defined but it actually is. I have seen this warning in multiple packages without a reason.

And finally, I see you comparing ruby-rack with rails, those are completely different things. Rails is a web framework as you mentioned and ruby-rack is just a middleware implementation which is also used by rails (rails depends on ruby-rack). In the broad pcs context, we are proposing the promotion of ruby-sinatra which is a web framework and it could be compared in some aspects with rails. I hope this clarifies things here.

Revision history for this message
Lucas Kanashiro (lucaskanashiro) wrote :

I uploaded ruby-rack version 3.0.0-1 to experimental:


Also packaged 2 new source packages containing the gems extracted from previous versions of ruby-rack:


Those 2 packages are in Debian NEW and requires ftp-master review, as you may know it might take some time. Moreover, the ruby team is concerned with all the breakages it might cause.

src:thin which is also one of the pcs dependencies we are aiming to promote depends on ruby-rack << 3, I filed an upstream bug asking for rack 3 support but we would need to provide a patch ourselves to get this fixed:


Due to all that, I'd like to ask to keep going with the promotion with the current ruby-rack version 2 while I try to move all the pieces to upgrade ruby-rack to version 3 which will likely take some time.

Steve Beattie (sbeattie)
tags: added: sec-1497
Revision history for this message
Mark Esler (eslerm) wrote :

Upgrading rack to 3 would be nice for security.

https://github.com/rack/rack/commit/a5762cf60af474b89b555ff8d151be5a021701f8 removes deprecated authentication methods, but likely breaks legacy support in thin.

Revision history for this message
Mark Esler (eslerm) wrote (last edit ):
Download full text (6.8 KiB)

I reviewed ruby-rack 2.2.4-2 as checked into kinetic. This shouldn't be considered a full audit but rather a quick gauge of maintainability.

> Rack provides a minimal, modular, and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the bridge between web servers, web frameworks, and web application into a single method call.

Rack 3.x is released, but many Ruby packages that depend on Rack have not migrated to 3.x. This security review considers the maintainability of Rack 2.x in the short-term and Rack 3.x maintainability in the long-term support. Security issues that are solved by Rack 3.x were not evaluated critically (see MD5 digest). The Security Team recommends against promoting Rack 2.x to main in a LTS release of Ubuntu (i.e., 24.04).

See 3.0.0.beta1's changelog: https://github.com/rack/rack/blob/main/CHANGELOG.md

- CVE History:
  - CVE-2011-5036, CVE-2012-6109, CVE-2013-0183, CVE-2013-0184, CVE-2013-0262, CVE-2013-0263, CVE-2015-3225, CVE-2018-16470, CVE-2018-16471, CVE-2019-16782, CVE-2020-8161, CVE-2020-8184, CVE-2022-30122, CVE-2022-30123
  - past CVEs relate to hash collisions, environmental variables, crypto timing attacks, regex, DoS (via specially crafted strings, packets, parameter calls), XSS, session hijacking, cookie validation, directory traversal, and shell escapes
  - see also https://github.com/rubysec/ruby-advisory-db/tree/master/gems/rack
  - recent CVEs are mentioned in CHANGELOG.md
  - recent commit fixes include CVE numbers
  - some CVEs also assigned GHSA numbers
  - ruby-rack security patches are made for multiple affected versions
    - hopefully upstream will support 2.x security patches
  - ruby-rack's github issue tracker is well maintained
  - ruby-rack has a robust Security Policy https://github.com/rack/rack/security/policy
- Build-Depends?
  - d/control requires gem2deb, rake, ruby-bacon, ruby-concurrent, ruby-dalli, ruby-minitest-global-expectations, ruby-webrick, thin
  - ruby-bacon is no longer being developed (see GH issue #32)
  - ruby-bacon and ruby-concurrent does not appear to be used by Rack
  - ruby-concurrent and ruby-webrick have open security issues on GitHub
  - thin dependency and handler were removed from rack 3.x
  - d/control needs to be cleaned up (deprecated depends, add Gemfile optional depends)
  - MIRs are missing for some dependencies
- pre/post inst/rm scripts?
  - none
- init scripts?
  - none
- systemd units?
  - none
- dbus services?
  - none
- setuid binaries?
  - none
- binaries in PATH?
  - /usr/bin/rackup
- sudo fragments?
  - none
- polkit files?
  - none
- udev rules?
  - none
- unit tests / autopkgtests?
  - d/ruby-tests.rake runs upstream's unit tests
  - contains simple autopkgtests
- cron jobs?
  - none
- Build logs:
  - nothing significant

- Processes spawned?
  - evals either removed in 3.x or non-user defined
    - see Rubocop section below
- Memory management?
  - ruby-dalli library provides memcached
    - removed in 3.x
  - ruby-concurrency has open GitHub issues for memory leaks
    - this d/controls build dependency does not appear to be used by Rake


Changed in ruby-rack (Ubuntu):
assignee: Ubuntu Security Team (ubuntu-security) → nobody
status: Confirmed → In Progress
Revision history for this message
Mark Esler (eslerm) wrote :

ruby-rack in jammy and older are affected by CVE-2022-30122 and CVE-2022-30123

Revision history for this message
Mark Esler (eslerm) wrote (last edit ):

Please note that the follow ruby-rack build dependencies are not in lunar main and do not have an open MIR: (1) gem2deb, (2) ruby-bacon, (3) ruby-concurrent, (4) ruby-dalli, and (5) ruby-minitest-global-expectations

edit: these dependencies are only required for build and do not require an MIR

Revision history for this message
Christian Ehrhardt  (paelzer) wrote : Re: [Bug 1990575] Re: [MIR] Promote ruby-rack to main as a pcs indirect dependency

On Sat, Jan 21, 2023 at 12:25 AM Mark Esler <email address hidden> wrote:
> Please note that the follow ruby-rack build dependencies are not in
> lunar main and do not have an open MIR: (1) gem2deb, (2) ruby-bacon, (3)
> ruby-concurrent, (4) ruby-dalli, and (5) ruby-minitest-global-
> expectations

That is fine as since Trusty only runtime dependencies are required.

Revision history for this message
Christian Ehrhardt  (paelzer) wrote :

Showing up in component mismatch now as planned.

Changed in ruby-rack (Ubuntu):
status: In Progress → Fix Committed
Revision history for this message
Christian Ehrhardt  (paelzer) wrote :

Promoted together with the full PCS stack, details see https://bugs.launchpad.net/ubuntu/+source/pcs/+bug/1953341/comments/13

Changed in ruby-rack (Ubuntu):
status: Fix Committed → Fix Released
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