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CVE-2020-7694— Log Injection

Quick assessment

Affected
n/a uvicorn
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.

Encode OSS Uvicorn是英国Encode OSS公司的一款基于uvloop和httptools构建的ASGI（Web服务器网关接口）服务器。 Encode OSS uvicorn（所有版本）中存在安全漏洞。攻击者可借助特制的URL利用该漏洞污染uvicorn的访问日志，影响此类文件的完整性。

CVSS 3.7 · Low EPSS 1.36% · P69

Possible ATT&CK Techniques 1 AI

T1560.002 · Archive via Library
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I. Basic Information for CVE-2020-7694

Vulnerability Information
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Vulnerability Title
Log Injection
Source: CVE Program / CVE List V5
Vulnerability Description
This affects all versions of package uvicorn. The request logger provided by the package is vulnerable to ASNI escape sequence injection. Whenever any HTTP request is received, the default behaviour of uvicorn is to log its details to either the console or a log file. When attackers request crafted URLs with percent-encoded escape sequences, the logging component will log the URL after it's been processed with urllib.parse.unquote, therefore converting any percent-encoded characters into their single-character equivalent, which can have special meaning in terminal emulators. By requesting URLs with crafted paths, attackers can: * Pollute uvicorn's access logs, therefore jeopardising the integrity of such files. * Use ANSI sequence codes to attempt to interact with the terminal emulator that's displaying the logs (either in real time or from a file).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Encode OSS Uvicorn 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Encode OSS Uvicorn是英国Encode OSS公司的一款基于uvloop和httptools构建的ASGI（Web服务器网关接口）服务器。 Encode OSS uvicorn（所有版本）中存在安全漏洞。攻击者可借助特制的URL利用该漏洞污染uvicorn的访问日志，影响此类文件的完整性。
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
- uvicorn 0 ~ unspecified -

II. Public POCs for CVE-2020-7694

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III. Intelligence Information for CVE-2020-7694

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Vendor Advisories for CVE-2020-7694 (1)

Other References for CVE-2020-7694 (1)

Same Patch Batch · n/a · 2020-07-27 · 12 CVEs total

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IV. Related Vulnerabilities

Same product: uvicorn
Same vendor: n/a

V. Comments for CVE-2020-7694

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