CVE-2020-1757

Description

A flaw was found in Undertow, where the servlet container causes the servletPath to normalize incorrectly by truncating the path after the semicolon. The flaw may lead to application mapping, resulting in a security bypass.

Mitigation

The issue can be mitigated by configuring UrlPathHelper to ignore the servletPath via setting "alwaysUseFullPath".

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score8.18.1N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityLowLowN/A
Privileges RequiredLowLowN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityHighHighN/A
Integrity ImpactHighHighN/A
Availability ImpactNoneNoneN/A

Vector

Red Hat: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Understanding the Weakness (CWE)

CWE-41

Confidentiality,Integrity,Access Control

Technical Impact: Read Files or Directories; Modify Files or Directories; Bypass Protection Mechanism

An attacker may be able to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. If the files are used for a security mechanism than an attacker may be able to bypass the mechanism.

Acknowledgements

Red Hat would like to thank Fedorov Oleksii (LINE Corporation), Keitaro Yamazaki (LINE Corporation), and Shiga Ryota (LINE Corporation) for reporting this issue.

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