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CVE-2020-15135— CSRF vulnerability in save-server

Quick assessment

Affected
Neztore save-server
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.

save-server是英国Neztore软件开发者的一款使用Node.js构建的ShareX文件服务器。 save-server（npm包）1.05之前版本中存在跨站请求伪造漏洞。该漏洞源于WEB应用未充分验证请求是否来自可信用户。攻击者可利用该漏洞通过受影响客户端向服务器发送非预期的请求。

CVSS 6.7 · Medium EPSS 0.72% · P52
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I. Basic Information for CVE-2020-15135

Vulnerability Information
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Vulnerability Title
CSRF vulnerability in save-server
Source: CVE Program / CVE List V5
Vulnerability Description
save-server (npm package) before version 1.05 is affected by a CSRF vulnerability, as there is no CSRF mitigation (Tokens etc.). The fix introduced in version version 1.05 unintentionally breaks uploading so version v1.0.7 is the fixed version. This is patched by implementing Double submit. The CSRF attack would require you to navigate to a malicious site while you have an active session with Save-Server (Session key stored in cookies). The malicious user would then be able to perform some actions, including uploading/deleting files and adding redirects. If you are logged in as root, this attack is significantly more severe. They can in addition create, delete and update users. If they updated the password of a user, that user's files would then be available. If the root password is updated, all files would be visible if they logged in with the new password. Note that due to the same origin policy malicious actors cannot view the gallery or the response of any of the methods, nor be sure they succeeded. This issue has been patched in version 1.0.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
save-server 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
save-server是英国Neztore软件开发者的一款使用Node.js构建的ShareX文件服务器。 save-server（npm包）1.05之前版本中存在跨站请求伪造漏洞。该漏洞源于WEB应用未充分验证请求是否来自可信用户。攻击者可利用该漏洞通过受影响客户端向服务器发送非预期的请求。
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
Neztore save-server < 1.0.5 -

II. Public POCs for CVE-2020-15135

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III. Intelligence Information for CVE-2020-15135

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Security Blog Posts for CVE-2020-15135 (1)

Other References for CVE-2020-15135 (1)

IV. Related Vulnerabilities

Same weakness: CWE-352

V. Comments for CVE-2020-15135

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