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

SECUNIA ADVISORY ID:
SA43420

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43420/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43420

RELEASE DATE:
2011-03-04

DISCUSS ADVISORY:
http://secunia.com/advisories/43420/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/43420/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=43420

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

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:
Update to version 1.8.7-334.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

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

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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