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CVE-2021-43783— Path Traversal in @backstage/plugin-scaffolder-backend

Quick assessment

Affected
backstage backstage
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

backstage是一个应用软件。后台是一个开放的平台,用于构建开发者门户 Backstage 中存在路径遍历漏洞，该漏洞源于产品未对具有scaffold模板写权限的用户的写入路径进行有效限制。攻击者可通过该漏洞将文件写入到任一目录。

CVSS 8.5 · High EPSS 1.21% · P66
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I. Basic Information for CVE-2021-43783

Vulnerability Information
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Vulnerability Title
Path Traversal in @backstage/plugin-scaffolder-backend
Source: CVE Program / CVE List V5
Vulnerability Description
@backstage/plugin-scaffolder-backend is the backend for the default Backstage software templates. In affected versions a malicious actor with write access to a registered scaffolder template is able to manipulate the template in a way that writes files to arbitrary paths on the scaffolder-backend host instance. This vulnerability can in some situation also be exploited through user input when executing a template, meaning you do not need write access to the templates. This method will not allow the attacker to control the contents of the injected file however, unless the template is also crafted in a specific way that gives control of the file contents. This vulnerability is fixed in version `0.15.14` of the `@backstage/plugin-scaffolder-backend`. This attack is mitigated by restricting access and requiring reviews when registering or modifying scaffolder templates.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
backstage 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
backstage是一个应用软件。后台是一个开放的平台,用于构建开发者门户 Backstage 中存在路径遍历漏洞，该漏洞源于产品未对具有scaffold模板写权限的用户的写入路径进行有效限制。攻击者可通过该漏洞将文件写入到任一目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 0.15.14 -

II. Public POCs for CVE-2021-43783

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III. Intelligence Information for CVE-2021-43783

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Patches & Fixes for CVE-2021-43783 (1)

Vendor Advisories for CVE-2021-43783 (1)

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-22

V. Comments for CVE-2021-43783

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