Resource Exhaustion Affecting ruby2.5-rubygem-puma package, versions <4.3.11-150000.3.6.2


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating

    Threat Intelligence

    EPSS
    1.97% (89th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-SLES152-RUBY25RUBYGEMPUMA-2808507
  • published 5 May 2022
  • disclosed 4 May 2022

How to fix?

Upgrade SLES:15.2 ruby2.5-rubygem-puma to version 4.3.11-150000.3.6.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby2.5-rubygem-puma package and not the ruby2.5-rubygem-puma package as distributed by SLES. See How to fix? for SLES:15.2 relevant fixed versions and status.

Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from having their requests starved by greedy persistent-connections saturating all threads in the same process. However, new connections may still be starved by greedy persistent-connections saturating all threads in all processes in the cluster. A puma server which received more concurrent keep-alive connections than the server had threads in its threadpool would service only a subset of connections, denying service to the unserved connections. This problem has been fixed in puma 4.3.8 and 5.3.1. Setting queue_requests false also fixes the issue. This is not advised when using puma without a reverse proxy, such as nginx or apache, because you will open yourself to slow client attacks (e.g. slowloris). The fix is very small and a git patch is available for those using unsupported versions of Puma.

CVSS Scores

version 3.1
Expand this section

NVD

7.5 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
Expand this section

SUSE

7.5 high
Expand this section

Red Hat

7.5 high