Vulnerability identifier: #VU8815

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-0903

CWE-ID: CWE-502

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 code on the target system.

The weakness exists due to YAML deserialization of gem specifications. A remote attacker can inject an instance of specially crafted serialized objects, gain elevated privileges and execute arbitrary Ruby code on RubyGems.org.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 2.6.14.

Vulnerable software versions

RubyGems: 2.0.0 - 2.6.13

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External links
http://blog.rubygems.org/2017/10/09/unsafe-object-deserialization-vulnerability.html

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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.