#VU33320 Permissions, Privileges, and Access Controls in Ruby - CVE-2012-4464

Vulnerability identifier: #VU33320

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-4464

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ruby
Universal components / Libraries / Scripting languages

Vendor: Ruby

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Ruby 1.9.3 before patchlevel 286 and 2.0 before revision r37068 allows context-dependent attackers to bypass safe-level restrictions and modify untainted strings via the (1) exc_to_s or (2) name_err_to_s API function, which marks the string as tainted, a different vulnerability than CVE-2012-4466. NOTE: this issue might exist because of a CVE-2011-1005 regression.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Ruby: 1.9.3

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2012-October/089554.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-October/089887.html
https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=37068
https://www.openwall.com/lists/oss-security/2012/10/02/4
https://www.openwall.com/lists/oss-security/2012/10/03/9
https://www.ruby-lang.org/en/news/2012/10/12/cve-2012-4464-cve-2012-4466/
https://bugzilla.redhat.com/show_bug.cgi?id=862598

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.