CVE intelligence and bounded remediation

CVE-2017-3839 — Cisco Secure Access Control System security vulnerability

Medium CVSS 4.3

An XML External Entity vulnerability in the web-based user interface of the Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to have read access to part of the information stored in the affected system. More Information: CSCvc04845. Known Affected Releases: 5.8(2.5).

Severity
Medium
CVSS
4.3 (3.0)
Published
2017-02-22
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-611

Affected products

  • cisco / secure_access_control_system / 5.8(2.5)

Matched remediation archetype

XML external entity and unsafe XML processing

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Check exposure

  • Inventory XML parsers used by APIs, file imports, office or image formats, identity protocols, feeds, and background jobs.
  • Determine whether document type declarations, external entities, XInclude, schemas, or network resolvers are enabled.
  • Map parser filesystem and network access and the sensitivity of documents it processes.

Remediate safely

  • Configure each parser to reject document type declarations and disable external entity, XInclude, and network resolution features.
  • Prefer a data format or hardened parser that does not support external resolution, and apply input size and depth limits.
  • Update affected XML libraries and centralize secure parser construction so callers cannot silently override it.

Authoritative sources

Complete CVE record and remediation plan

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