bluemonday sanitizer up to 0.0.8/1.0.16 on Go/Python Policy access control

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

A vulnerability, which was classified as critical, has been found in bluemonday sanitizer up to 0.0.8/1.0.16 on Go/Python. This issue affects some unknown processing of the component Policy Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-284. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The bluemonday sanitizer before 1.0.16 for Go, and before 0.0.8 for Python (in pybluemonday), does not properly enforce policies associated with the SELECT, STYLE, and OPTION elements.

The weakness was disclosed 10/18/2021. It is possible to read the advisory at docs.google.com. The identification of this vulnerability is CVE-2021-42576 since 10/18/2021. The exploitation is known to be easy. The attack may be initiated remotely. Required for exploitation is a simple authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/22/2021). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

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

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CVSSv3infoedit

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

10/18/2021 Advisory disclosed
10/18/2021 +0 days CVE assigned
10/18/2021 +0 days VulDB entry created
10/22/2021 +4 days VulDB last update

Sourcesinfoedit

Advisory: docs.google.com
Status: Not defined

CVE: CVE-2021-42576 (🔒)

Entryinfoedit

Created: 10/18/2021 06:22 PM
Updated: 10/22/2021 02:24 PM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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