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CVE-2021-43776— XSS vulnerability in @backstage/plugin-auth-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 存在跨站脚本漏洞，该漏洞源于在受影响的版本中，auth-backend插件缺少针对URL参数的过滤与转义。这种攻击可能允许攻击者可利用该漏洞从用户的浏览器中窃取访问令牌或其他秘密。

CVSS 7.4 · High EPSS 0.66% · P49

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-43776

Vulnerability Information
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Vulnerability Title
XSS vulnerability in @backstage/plugin-auth-backend
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
backstage 跨站脚本漏洞
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 存在跨站脚本漏洞，该漏洞源于在受影响的版本中，auth-backend插件缺少针对URL参数的过滤与转义。这种攻击可能允许攻击者可利用该漏洞从用户的浏览器中窃取访问令牌或其他秘密。
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 < 0.4.9 -

II. Public POCs for CVE-2021-43776

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III. Intelligence Information for CVE-2021-43776

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Vendor Advisories for CVE-2021-43776 (1)

Other References for CVE-2021-43776 (1)

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-79

V. Comments for CVE-2021-43776

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