Staging Environment: Content and features may be unstable or change without notice.
Advisory details: ruby_advisory_db / gems/actionpack/CVE-2016-0751
Advisory ID ruby_advisory_db/gems/actionpack/CVE-2016-0751
Aliases CVE-2016-0751
GHSA-ffpv-c4hm-3x6v
Summary Possible Object Leak and Denial of Service attack in Action Pack There is a possible object leak which can lead to a denial of service vulnerability in Action Pack. This vulnerability has been assigned the CVE identifier CVE-2016-0751. Versions Affected: All. Not affected: None. Fixed Versions: 5.0.0.beta1.1, 4.2.5.1, 4.1.14.1, 3.2.22.1 Impact ------ A carefully crafted accept header can cause a global cache of mime types to grow indefinitely which can lead to a possible denial of service attack in Action Pack. All users running an affected release should either upgrade or use one of the workarounds immediately. Releases -------- The FIXED releases are available at the normal locations. Workarounds ----------- This attack can be mitigated by a proxy that only allows known mime types in the Accept header. Placing the following code in an initializer will also mitigate the issue: ```ruby require 'action_dispatch/http/mime_type' Mime.const_set :LOOKUP, Hash.new { |h,k| Mime::Type.new(k) unless k.blank? } ``` Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. * 5-0-mime_types_leak.patch - Patch for 5.0 series * 4-2-mime_types_leak.patch - Patch for 4.2 series * 4-1-mime_types_leak.patch - Patch for 4.1 series * 3-2-mime_types_leak.patch - Patch for 3.2 series Please note that only the 4.1.x and 4.2.x series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases. Credits ------- Aaron Patterson <3<3
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv2 5.0
cvssv3 7.5
Reference id Reference type URL
https://groups.google.com/forum/#!topic/rubyonrails-security/9oLY_FCzvoc

No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.

There are no known vectors.

There are no SSVC decisions available.