Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2020-15861

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

Published: Aug 20, 2020 | Modified: Dec 03, 2022
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
8 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-15861
CWEhttps://cwe.mitre.org/data/definitions/59.html

Net-SNMP through 5.7.3 allows Escalation of Privileges because of UNIX symbolic link (symlink) following.

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
Net-snmp Net-snmp * 5.7.3 (including)
Net-snmp Ubuntu bionic *
Net-snmp Ubuntu devel *
Net-snmp Ubuntu focal *
Net-snmp Ubuntu trusty *
Net-snmp Ubuntu trusty/esm *
Net-snmp Ubuntu upstream *
Net-snmp Ubuntu xenial *

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

Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and run their businesses with minimal friction. The Aqua Cloud Native Security Platform provides prevention, detection, and response automation across the entire application lifecycle to secure the build, secure cloud infrastructure and secure running workloads wherever they are deployed.
Copyright © 2024 Aqua Security Software Ltd.   Privacy Policy | Terms of Use