Yii up to 2.0.15.1 CORS Policy Converter Wildcard origin validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Yii up to 2.0.15.1. It has been classified as critical. This affects an unknown part of the component CORS Policy Converter. Performing a manipulation as part of Wildcard results in origin validation. This vulnerability is known as CVE-2018-20745. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Yii up to 2.0.15.1. This affects an unknown code block of the component CORS Policy Converter. The manipulation as part of a Wildcard leads to a origin validation vulnerability. CWE is classifying the issue as CWE-346. The product does not properly verify that the source of data or communication is valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.

The bug was discovered 04/29/2018. The weakness was published 01/28/2019 (Website). It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2018-20745 since 01/28/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 274 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Origin validation
CWE: CWE-346 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/29/2018 🔍
01/28/2019 +274 days 🔍
01/28/2019 +0 days 🔍
01/28/2019 +0 days 🔍
01/28/2019 +0 days 🔍
07/03/2023 +1617 days 🔍

Sourcesinfo

Advisory: 16193
Status: Not defined

CVE: CVE-2018-20745 (🔍)
GCVE (CVE): GCVE-0-2018-20745
GCVE (VulDB): GCVE-100-130275

Entryinfo

Created: 01/28/2019 16:25
Updated: 07/03/2023 14:55
Changes: 01/28/2019 16:25 (56), 05/06/2020 12:04 (1), 07/03/2023 14:55 (3)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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