Vulnerability identifier: #VU20189

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-8324

CWE-ID: CWE-94

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 vulnerability exists due to improper input validation when processing multiple line entries within gems in ensure_loadable_spec(). A remote attacker can send a specially crafted gem, inject malicious code into stub line of gemspec and execute it code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

RubyGems: 2.6.0 - 3.0.1

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External links
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
http://hackerone.com/reports/328571

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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.