CVE-2017-7553

Description

The external_request api call in App Studio (millicore) allows server side request forgery (SSRF). An attacker could use this flaw to probe the network internal resources and access restricted endpoints.

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 Score66.3N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityHighLowN/A
Privileges RequiredLowLowN/A
User InteractionNoneNoneN/A
ScopeChangedUnchangedN/A
ConfidentialityLowLowN/A
Integrity ImpactLowLowN/A
Availability ImpactLowLowN/A

Vector

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

NVD: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Understanding the Weakness (CWE)

CWE-918

Confidentiality

Technical Impact: Read Application Data

Integrity

Technical Impact: Execute Unauthorized Code or Commands

Access Control

Technical Impact: Bypass Protection Mechanism

By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.

Acknowledgements

Red Hat would like to thank Tomas Rzepka for reporting this issue.

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