Bug 962705 – CVE-2012-6143 perl-Spoon (Spoon::Cookie): Do not run Storable::thaw() on arbitrary untrusted user input

Bug 962705 - (CVE-2012-6143) CVE-2012-6143 perl-Spoon (Spoon::Cookie): Do not run Storable::thaw() on arbitrary untrusted user input

Summary:	CVE-2012-6143 perl-Spoon (Spoon::Cookie): Do not run Storable::thaw() on arbi...

Status:	NEW

Aliases:	CVE-2012-6143

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Target Release:	---
Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=moderate,public=20130512,repor...
Keywords:	Security

Depends On:	962708 962707
Blocks:
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Reported:	2013-05-14 05:56 EDT by Jan Lieskovsky
Modified:	2015-07-31 03:06 EDT (History)
CC List:	2 users (show)

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Doc Type:	Bug Fix
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Description Jan Lieskovsky 2013-05-14 05:56:06 EDT

Spoon::Cookie Perl module allows storing data of any type on the client side browser using HTTP cookies. The data is subsequently serialized and deserialized using Perl's Storable module without any further checks for possible tampering.

Since the Perl's Storable module has been documented to be unsuitable for these purposes:
  [1] http://perl5.git.perl.org/perl.git/commit/664f237a84176c09b20b62dbfe64dd736a7ce05e

(as reported) the current Spoon::Cookie behaviour is dangerous as it will run Storable::thaw() on arbitrary untrusted user input. A remote attacker could provide a specially-crafted Spoon::Cookie input that, when processed with Storable::thaw() would lead to Storable module to load the module corresponding to the class of the object in the deserializing module, possibly leading to arbitrary code execution (with the privileges of the user running the application utilizing the services of the Spoon::Cookie module).

Spoon CPAN module ticket:
[2] https://rt.cpan.org/Public/Bug/Display.html?id=85217

References:
[3] http://www.openwall.com/lists/oss-security/2013/05/13/1

Comment 1 Jan Lieskovsky 2013-05-14 06:00:00 EDT

This issue affects the versions of the perl-Spoon package, as shipped with Fedora release of 17, 18, and Fedora EPEL-6. Please schedule an update once there is final upstream patch available (doesn't seem to be as of right now).

Comment 2 Jan Lieskovsky 2013-05-14 06:01:08 EDT

Created perl-Spoon tracking bugs for this issue

Affects: fedora-all [bug 962707]
Affects: epel-6 [bug 962708]

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