#VU8122 Command injection in RubyGems - CVE-2015-9096

Vulnerability identifier: #VU8122

Vulnerability risk: Low

CVSSv4.0: 6.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-9096

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
RubyGems
Universal components / Libraries / Libraries used by multiple products

Vendor: Ruby

Description
The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The weakness exists due to improper validation of user supplied input in the Net::SMTP function. A remote attacker can use CRLF sequences in a RCPT TO or MAIL FROM command and execute arbitrary SMTP commands on the system.

Mitigation
Update to version 2.4.0.

Vulnerable software versions

RubyGems: 2.2.0 - 2.3.4

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External links
https://github.com/ruby/openssl/issues/49

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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.