Security Advisory SA43420 - Ruby "#to_s" Safe Level Security Bypass Vulnerability

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Secunia Advisory SA43420

Ruby "#to_s" Safe Level Security Bypass Vulnerability

Secunia Advisory

SA43420

Release Date

2011-02-21

Last Update

2012-10-08

Popularity

2,465 views

Comments

0 comments

Criticality level

Less critical

Impact

Security Bypass

Where

From remote

Authentication level

This information is available to Secunia VIM customers

Report reliability

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Solution Status

Vendor Workaround

Systems affected

This information is available to Secunia VIM customers

Approve distribution

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Software:

Ruby 1.8.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2011-1005 CVSS score available to Secunia VIM customers
CVE-2012-4481 CVSS score available to Secunia VIM customers

Description

A vulnerability has been reported in Ruby, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error within the exception "#to_s" handling and can be exploited to bypass the safe level protection and e.g. modify protected strings.

The vulnerability is reported in version 1.8.6 patchlevel 420 and prior and version 1.8.7 patchlevel 330 and prior. The 1.9.x branch is not affected.

Solution
Fixed in the source code repository.

Provided and/or discovered by
Reported by the vendor.

Incomplete fix reported by Vit Ondruch, Red Hat.

Changelog
Further details available to Secunia VIM customers

Original Advisory
Ruby:
http://www.ruby-lang.org/en/news/2011/02/18/exception-methods-can-bypass-safe/

Red Hat:
https://bugzilla.redhat.com/show_bug.cgi?id=863484

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Ruby "#to_s" Safe Level Security Bypass Vulnerability

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Secunia Advisory SA43420

Ruby "#to_s" Safe Level Security Bypass Vulnerability

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