A flaw was found in the way the Action Pack component performed MIME type lookups. Since queries were cached in a global cache of MIME types, an attacker could use this flaw to grow the cache indefinitely, potentially resulting in a denial of service.
Find out more about CVE-2016-0751 from the MITRE CVE dictionary dictionary and NIST NVD.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:N/A:P |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Partial |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (rh-ror41-rubygem-actionpack) | RHSA-2016:0296 | 2016-02-24 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (ruby193-rubygem-actionpack) | RHSA-2016:0455 | 2016-03-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (ror40-rubygem-actionpack) | RHSA-2016:0454 | 2016-03-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (rh-ror41-rubygem-actionpack) | RHSA-2016:0296 | 2016-02-24 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (ror40-rubygem-actionpack) | RHSA-2016:0454 | 2016-03-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (ruby193-rubygem-actionpack) | RHSA-2016:0455 | 2016-03-15 |
| Platform | Package | State |
|---|---|---|
| Red Hat Subscription Asset Manager 1 | ruby193-rubygem-actionpack | Will not fix |
| Red Hat Subscription Asset Manager 1 | rubygem-actionpack | Will not fix |
Use following code to monkey-patch mime types cache and disable caching.
require 'action_dispatch/http/mime_type'
Mime.const_set :LOOKUP, Hash.new { |h,k|
Mime::Type.new(k) unless k.blank?
}
Alternatively perform filtering of mime types in the Accept header to allow only known types.
Vulmon