Ruby up to 2.0.0 Patchlevel 644/2.1.5/2.2.1 OpenSSL Extension verify_certificate_identity Certificate 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.
5.6$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Ruby up to 2.0.0 Patchlevel 644/2.1.5/2.2.1. Affected is the function verify_certificate_identity of the component OpenSSL Extension. The manipulation as part of Certificate results in input validation. This vulnerability was named CVE-2015-1855. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Ruby up to 2.0.0 Patchlevel 644/2.1.5/2.2.1 (Programming Language Software). It has been classified as critical. Affected is the function verify_certificate_identity of the component OpenSSL Extension. The manipulation as part of a Certificate leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

The bug was discovered 04/13/2015. The weakness was presented 11/29/2019. This vulnerability is traded as CVE-2015-1855. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 44 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 83881 (Amazon Linux AMI : ruby18 (ALAS-2015-529)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370192 (Apple Mac OS X v10.11 Not Installed (APPLE-SA-2015-09-30-3)).

Upgrading to version 2.0.0 Patchlevel 645, 2.1.6 or 2.2.2 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (83881). See VDB-75229 for similar entry. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 83881
Nessus Name: Amazon Linux AMI : ruby18 (ALAS-2015-529)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 902047
OpenVAS Name: Amazon Linux Local Check: ALAS-2015-533
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Ruby 2.0.0 Patchlevel 645/2.1.6/2.2.2

Timelineinfo

02/17/2015 🔍
04/13/2015 +55 days 🔍
05/27/2015 +44 days 🔍
05/29/2015 +2 days 🔍
11/29/2019 +1645 days 🔍
12/03/2019 +4 days 🔍
11/21/2024 +1815 days 🔍

Sourcesinfo

Advisory: 9644
Status: Confirmed

CVE: CVE-2015-1855 (🔍)
GCVE (CVE): GCVE-0-2015-1855
GCVE (VulDB): GCVE-100-146508

OVAL: 🔍
See also: 🔍

Entryinfo

Created: 12/03/2019 15:59
Updated: 11/21/2024 22:46
Changes: 12/03/2019 15:59 (44), 12/03/2019 16:04 (28), 03/05/2024 08:43 (6), 11/21/2024 22:46 (19)
Complete: 🔍
Cache ID: 216:DEF:103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!