Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2019-7183

Improper Link Resolution Before File Access ('Link Following')

Published: Dec 05, 2019 | Modified: Dec 10, 2019
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-7183
CWEhttps://cwe.mitre.org/data/definitions/59.html

This improper link resolution vulnerability allows remote attackers to access system files. To fix this vulnerability, QNAP recommend updating QTS to their latest versions.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
Qts Qnap 4.2.6 (including) 4.2.6 (including)
Qts Qnap 4.3.3.0868 (including) 4.3.3.0868 (including)
Qts Qnap 4.3.3.0998 (including) 4.3.3.0998 (including)
Qts Qnap 4.3.4.0899 (including) 4.3.4.0899 (including)
Qts Qnap 4.3.4.1029 (including) 4.3.4.1029 (including)
Qts Qnap 4.3.6.0895 (including) 4.3.6.0895 (including)
Qts Qnap 4.3.6.0907 (including) 4.3.6.0907 (including)
Qts Qnap 4.3.6.0923 (including) 4.3.6.0923 (including)
Qts Qnap 4.3.6.0944 (including) 4.3.6.0944 (including)
Qts Qnap 4.3.6.0959 (including) 4.3.6.0959 (including)
Qts Qnap 4.3.6.0979 (including) 4.3.6.0979 (including)
Qts Qnap 4.3.6.0993 (including) 4.3.6.0993 (including)
Qts Qnap 4.3.6.1013 (including) 4.3.6.1013 (including)
Qts Qnap 4.3.6.1033 (including) 4.3.6.1033 (including)
Qts Qnap 4.4.1.0948-beta (including) 4.4.1.0948-beta (including)
Qts Qnap 4.4.1.0949-beta (including) 4.4.1.0949-beta (including)
Qts Qnap 4.4.1.0978-beta_2 (including) 4.4.1.0978-beta_2 (including)
Qts Qnap 4.4.1.0998-beta_3 (including) 4.4.1.0998-beta_3 (including)
Qts Qnap 4.4.1.0999-beta_3 (including) 4.4.1.0999-beta_3 (including)
Qts Qnap 4.4.1.1031-beta_4 (including) 4.4.1.1031-beta_4 (including)
Qts Qnap 4.4.1.1033-beta_4 (including) 4.4.1.1033-beta_4 (including)
Qts Qnap 4.4.1.1064 (including) 4.4.1.1064 (including)
Qts Qnap 4.4.1.1081 (including) 4.4.1.1081 (including)
Qts Qnap 4.4.1.1086 (including) 4.4.1.1086 (including)
Qts Qnap 4.4.1.1101 (including) 4.4.1.1101 (including)

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References

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