Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0 UNIXServer.open/UNIXSocket.open Null Character input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0. This affects the function UNIXServer.open/UNIXSocket.open. The manipulation as part of Null Character leads to input validation. This vulnerability is uniquely identified as CVE-2018-8779. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0 (Programming Language Software). It has been rated as critical. This issue affects the function UNIXServer.open/UNIXSocket.open. The manipulation as part of a Null Character leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, the UNIXServer.open and UNIXSocket.open methods are not checked for null characters. It may be connected to an unintended socket.

The bug was discovered 03/28/2018. The weakness was disclosed 04/03/2018 (Website). It is possible to read the advisory at ruby-lang.org. The identification of this vulnerability is CVE-2018-8779 since 03/19/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109284 (Debian DLA-1359-1 : ruby1.8 security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 237072 (Red Hat Update for rh-ruby25-ruby (RHSA-2018:3731)).

Upgrading to version 2.2.10, 2.3.7, 2.4.4, 2.5.1 or 2.6.0-preview1 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109284), SecurityFocus (BID 103767†) and CERT Bund (WID-SEC-2023-1111). The entries VDB-114428, VDB-114429, VDB-114430 and VDB-114431 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Open Source Ruby
• Open Source Arch Linux

Productinfo

Type

• Programming Language Software

Name

• Ruby

Version

• 2.0
• 2.1
• 2.2
• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.3
• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.4
• 2.4.0
• 2.4.1
• 2.4.2
• 2.4.3
• 2.5.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 109284
Nessus Name: Debian DLA-1359-1 : ruby1.8 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 860813
OpenVAS Name: Debian LTS Advisory ([SECURITY] [DLA 1358-1] ruby1.9.1 security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Ruby 2.2.10/2.3.7/2.4.4/2.5.1/2.6.0-preview1

Timelineinfo

03/19/2018 🔍
03/28/2018 +9 days 🔍
03/28/2018 +0 days 🔍
04/03/2018 +6 days 🔍
04/03/2018 +0 days 🔍
04/04/2018 +1 days 🔍
04/23/2018 +19 days 🔍
04/24/2018 +1 days 🔍
05/10/2026 +2937 days 🔍

Sourcesinfo

Advisory: RHSA-2018:3729
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-8779 (🔍)
GCVE (CVE): GCVE-0-2018-8779
GCVE (VulDB): GCVE-100-115667

OVAL: 🔍

SecurityFocus: 103767 - Ruby CVE-2018-8779 Security Bypass Vulnerability
SecurityTracker: 1042004
CERT Bund: WID-SEC-2023-1111 - Ruby: Mehrere Schwachstellen

See also: 🔍

Entryinfo

Created: 04/04/2018 09:55
Updated: 05/10/2026 01:34
Changes: 04/04/2018 09:55 (77), 01/21/2020 09:13 (6), 02/08/2021 11:45 (2), 02/26/2023 14:43 (3), 05/10/2026 01:34 (21)
Complete: 🔍
Cache ID: 216::103

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