Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0 RubyGems package.rb install_location path traversal

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.
6.8	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0. It has been declared as critical. The affected element is the function install_location of the file package.rb of the component RubyGems. Such manipulation leads to path traversal. This vulnerability is listed as CVE-2018-1000073. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Ruby up to 2.2.9/2.3.6/2.4.3/2.5.0 (Programming Language Software). Affected by this issue is the function install_location of the file package.rb of the component RubyGems. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. CVE summarizes:

RubyGems version Ruby 2.2 series: 2.2.9 and earlier, Ruby 2.3 series: 2.3.6 and earlier, Ruby 2.4 series: 2.4.3 and earlier, Ruby 2.5 series: 2.5.0 and earlier, prior to trunk revision 62422 contains a Directory Traversal vulnerability in install_location function of package.rb that can result in path traversal when writing to a symlinked basedir outside of the root. This vulnerability appears to have been fixed in 2.7.6.

The bug was discovered 02/15/2018. The weakness was presented 03/13/2018 (Website). The advisory is shared for download at blog.rubygems.org. This vulnerability is handled as CVE-2018-1000073 since 02/21/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability was handled as a non-public zero-day exploit for at least 26 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109058 (Ubuntu 14.04 LTS : ruby1.9.1, ruby2.0 regression (USN-3621-2)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu 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 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109058) and SecurityFocus (BID 103686†). See VDB-114429, VDB-114430, VDB-114431 and VDB-114432 for similar entries. Once again VulDB remains the best source for vulnerability data.

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: 7.0
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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: Path traversal
CWE: CWE-22
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: 109058
Nessus Name: Ubuntu 14.04 LTS : ruby1.9.1, ruby2.0 regression (USN-3621-2)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881453
OpenVAS Name: Fedora Update for ruby FEDORA-2018-1fffa787e7
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: 🔍

Patch: github.com

Timelineinfo

02/15/2018 🔍
02/21/2018 +6 days 🔍
03/13/2018 +20 days 🔍
03/13/2018 +0 days 🔍
03/14/2018 +1 days 🔍
03/28/2018 +14 days 🔍
04/13/2018 +16 days 🔍
04/16/2018 +3 days 🔍
02/21/2023 +1772 days 🔍

Sourcesinfo

Advisory: USN-3621-2
Status: Confirmed

CVE: CVE-2018-1000073 (🔍)
GCVE (CVE): GCVE-0-2018-1000073
GCVE (VulDB): GCVE-100-114428

OVAL: 🔍

SecurityFocus: 103686 - Ruby CVE-2018-6914 Directory Traversal Vulnerability

See also: 🔍

Entryinfo

Created: 03/14/2018 07:44
Updated: 02/21/2023 14:13
Changes: 03/14/2018 07:44 (77), 01/12/2020 20:12 (5), 02/21/2023 14:12 (5), 02/21/2023 14:13 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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