Vulnerability identifier: #VU30579

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-4121

CWE-ID: CWE-326

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 execute arbitrary code.

The OpenSSL extension of Ruby (Git trunk) versions after 2011-09-01 up to 2011-11-03 always generated an exponent value of '1' to be used for private RSA key generation. A remote attacker could use this flaw to bypass or corrupt integrity of services, depending on strong private RSA keys generation mechanism.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Ruby: 1.9.0 - 1.9.2-p180

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External links
http://www.openwall.com/lists/oss-security/2013/07/01/1
http://access.redhat.com/security/cve/cve-2011-4121
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121
http://security-tracker.debian.org/tracker/CVE-2011-4121

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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.