CVE-2020-26261— user-readable api tokens in systemd units
Quick assessment
Affected
jupyterhub systemdspawner
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.
JupyterHub是一款用于Jupyter的多用户服务器。 jupyterhub-systemdspawner 存在安全漏洞，该漏洞源于systemdspawner允许JupyterHub使用systemd生成单用户笔记本服务器。在版本0.15之前，在systemd单元环境中指定发送给单用户服务器的用户API令牌。所有用户都不能正确地访问这些令牌。特别是，littlest-jupyterhub会受到影响，它默认使用systemdspawner。在jupyterhub-systemdspawner v0.
Possible ATT&CK Techniques 1 AI
T1552.004 · Private Keys
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I. Basic Information for CVE-2020-26261
Vulnerability Information
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Vulnerability Title
user-readable api tokens in systemd units
Source: CVE Program / CVE List V5
Vulnerability Description
jupyterhub-systemdspawner enables JupyterHub to spawn single-user notebook servers using systemd. In jupyterhub-systemdspawner before version 0.15 user API tokens issued to single-user servers are specified in the environment of systemd units. These tokens are incorrectly accessible to all users. In particular, the-littlest-jupyterhub is affected, which uses systemdspawner by default. This is patched in jupyterhub-systemdspawner v0.15
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
JupyterHub 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterHub是一款用于Jupyter的多用户服务器。 jupyterhub-systemdspawner 存在安全漏洞，该漏洞源于systemdspawner允许JupyterHub使用systemd生成单用户笔记本服务器。在版本0.15之前，在systemd单元环境中指定发送给单用户服务器的用户API令牌。所有用户都不能正确地访问这些令牌。特别是，littlest-jupyterhub会受到影响，它默认使用systemdspawner。在jupyterhub-systemdspawner v0.
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 |
|---|---|---|---|---|
| jupyterhub | systemdspawner | < 0.15 | - |
|
II. Public POCs for CVE-2020-26261
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2020-26261 (1)
Vendor Advisories for CVE-2020-26261 (1)
Other References for CVE-2020-26261 (2)
-
https://pypi.org/project/jupyterhub-systemdspawner/ x_refsource_MISC
IV. Related Vulnerabilities
Same vendor: jupyterhub
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CVE-2026-54338
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OAuthenticator: Authentication Bypass in Auth0OAuthenticator
Same weakness: CWE-668
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Cross-namespace FeatureFlagSource and InProcessConfiguration -
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vm2 3.11.3 through 3.11.6 HTTPS Credential Exposure via glob -
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V. Comments for CVE-2020-26261
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