Cisco IP Phone 8800 Series Path Traversal Vulnerability

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• cisco ip conference phone 8832 firmwarebefore 12.5\(1\)sr1
• cisco ip phone 8800 firmwarebefore 12.5\(1\)sr1
• cisco ip phone 8821 firmwarebefore 11.0\(5\)
• cisco ip phone 8821-ex firmwarebefore 11.0\(5\)

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

• Cisco Cisco IP Conference Phone 8832 and the rest of the IP Phone 8800 Series

  • unspecified and later · before 12.5(1)SR1affected

• Cisco Cisco Wireless IP Phone 8821 and 8821-EX

  • unspecified and later · before 11.0(5)affected

Other highest-scoring records for the same primary product.

• CVE-2019-1716Cisco IP Phone 7800 Series and 8800 Series Remote Code Execution Vulnerability
  40Plan
• CVE-2019-1764Cisco IP Phone 8800 Series Cross-Site Request Forgery Vulnerability
  35Monitor
• CVE-2019-1763Cisco IP Phone 8800 Series Authorization Bypass Vulnerability
  31Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.