CVE-2021-43855
CVSS V2 Low 3.5
CVSS V3 Medium 5.4
Description
Wiki.js is a wiki app built on node.js. Wiki.js 2.5.263 and earlier is vulnerable to stored cross-site scripting through a SVG file upload made via a custom request with a fake MIME type. By creating a crafted SVG file, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the SVG is viewed directly by other users. Scripts do not execute when loaded inside a page via normal `<img>` tags. The malicious SVG can only be uploaded by crafting a custom request to the server with a fake MIME type. A patch in version 2.5.264 fixes this vulnerability by adding an additional file extension verification check to the optional (enabled by default) SVG sanitization step to all file uploads that match the SVG mime type. As a workaround, disable file upload for all non-trusted users.
Overview
- CVE ID
- CVE-2021-43855
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-12-27T18:15:07
- Last Modified Date
- 2022-01-07T14:01:44
Weakness Enumerations
CPE Configuration (Product)
CPE | Vulnerable | Operator | Version Start | Version End |
---|---|---|---|---|
cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:* | 1 | OR | 2.5.264 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:S/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- SINGLE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 3.5
- Severity
- LOW
- Exploitability Score
- 6.8
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 5.4
- Base Severity
- MEDIUM
- Exploitability Score
- 2.3
- Impact Score
- 2.7
References
Reference URL | Reference Tags |
---|---|
https://github.com/Requarks/wiki/commit/57b56d3a5b9c00358814e76f3ee5b4bb353ad62f | Patch Third Party Advisory |
https://github.com/Requarks/wiki/security/advisories/GHSA-4893-pj5w-3hq9 | Exploit Patch Third Party Advisory |
https://github.com/Requarks/wiki/releases/tag/2.5.264 | Release Notes Third Party Advisory |
Sources
Source Name | Source URL |
---|---|
NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-43855 |
MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43855 |
History
Created | Old Value | New Value | Data Type | Notes |
---|---|---|---|---|
2022-05-10 06:38:06 | Added to TrackCVE | |||
2022-12-06 05:13:51 | 2021-12-27T18:15Z | 2021-12-27T18:15:07 | CVE Published Date | updated |
2022-12-06 05:13:51 | 2022-01-07T14:01:44 | CVE Modified Date | updated | |
2022-12-06 05:13:51 | Analyzed | Vulnerability Status | updated |