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CVE-2019-16764— PowAssent is susceptible to denial of service attacks

Quick assessment

Affected
pow-auth pow_assent
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.

PowAssent是一个Pow身份验证和用户管理库的多供应商支持版本。 PowAssent中存在安全漏洞。攻击者可利用该漏洞造成拒绝服务（崩溃）。

CVSS 6.5 · Medium EPSS 1.08% · P64

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2019-16764

Vulnerability Information
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Vulnerability Title
PowAssent is susceptible to denial of service attacks
Source: CVE Program / CVE List V5
Vulnerability Description
The use of `String.to_atom/1` in PowAssent is susceptible to denial of service attacks. In `PowAssent.Phoenix.AuthorizationController` a value is fetched from the user provided params, and `String.to_atom/1` is used to convert the binary value to an atom so it can be used to fetch the provider configuration value. This is unsafe as it is user provided data, and can be used to fill up the whole atom table of ~1M which will cause the app to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
PowAssent 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowAssent是一个Pow身份验证和用户管理库的多供应商支持版本。 PowAssent中存在安全漏洞。攻击者可利用该漏洞造成拒绝服务（崩溃）。
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
pow-auth pow_assent < 0.4.4 ~ 0.4.4 -

II. Public POCs for CVE-2019-16764

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III. Intelligence Information for CVE-2019-16764

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Patches & Fixes for CVE-2019-16764 (1)

Vendor Advisories for CVE-2019-16764 (1)

Other References for CVE-2019-16764 (2)

IV. Related Vulnerabilities

Same vendor: pow-auth
Same weakness: CWE-400

V. Comments for CVE-2019-16764

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