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[email protected]CVE-2020-8903

HistoryJun 22, 2020 - 2:15 p.m.

CVE-2020-8903

2020-06-2214:15:11

CWE-276

[email protected]

web.nvd.nist.gov

133

cve-2020-8903

google cloud platform

guest-oslogin

privilege escalation

dhcp xid manipulation

nvd

security vulnerability

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.3 High

CVSS4

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

ACTIVE

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:A/VC:H/SC:H/VI:H/SI:H/VA:H/SA:H

7.3 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

33.4%

JSON

A vulnerability in Google Cloud Platform’s guest-oslogin versions between 20190304 and 20200507 allows a user that is only granted the role “roles/compute.osLogin” to escalate privileges to root. Using their membership to the “adm” group, users with this role are able to read the DHCP XID from the systemd journal. Using the DHCP XID, it is then possible to set the IP address and hostname of the instance to any value, which is then stored in /etc/hosts. An attacker can then point metadata.google.internal to an arbitrary IP address and impersonate the GCE metadata server which make it is possible to instruct the OS Login PAM module to grant administrative privileges. All images created after 2020-May-07 (20200507) are fixed, and if you cannot update, we recommend you edit /etc/group/security.conf and remove the “adm” user from the OS Login entry.

Affected configurations

NVD

Node

googleguest-osloginRange20190304.00–20200507.00

Node

opensuseleapMatch15.1

opensuseleapMatch15.2

CPENameOperatorVersion
google:guest-oslogingoogle guest-osloginle20200507.00

CPE	Name	Operator	Version
google:guest-oslogin	google guest-oslogin	le	20200507.00

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "guest-oslogin",
    "vendor": "Google LLC",
    "versions": [
      {
        "lessThan": "20200507",
        "status": "affected",
        "version": "20190304",
        "versionType": "date"
      },
      {
        "status": "unaffected",
        "version": "20200507",
        "versionType": "date"
      }
    ]
  }
]