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CanonicalCVE-2020-11934

HistoryJul 29, 2020 - 5:15 p.m.

CVE-2020-11934

2020-07-2917:15:12

CWE-668

canonical

web.nvd.nist.gov

cve-2020-11934

snapctl user-open

vulnerability

snapd

access restriction

xdg-open

ubuntu core

nvd

CVSS2

1.9

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

5.9

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

5.9

Confidence

High

EPSS

Percentile

12.6%

JSON

It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.

Affected configurations

Nvd

Node

canonicalubuntu_linuxMatch16.04lts

canonicalubuntu_linuxMatch18.04lts

canonicalubuntu_linuxMatch19.10

canonicalubuntu_linuxMatch20.04lts

VendorProductVersionCPE
canonicalubuntu_linux16.04cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonicalubuntu_linux18.04cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonicalubuntu_linux19.10cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
canonicalubuntu_linux20.04cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

Vendor	Product	Version	CPE
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
canonical	ubuntu_linux	18.04	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
canonical	ubuntu_linux	19.10	cpe:2.3:o:canonical:ubuntu_linux:19.10:::::::*
canonical	ubuntu_linux	20.04	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::

CNA Affected

[
  {
    "product": "snapd",
    "vendor": "Canonical",
    "versions": [
      {
        "changes": [
          {
            "at": "2.45.1+18.04.2",
            "status": "unaffected"
          },
          {
            "at": "2.45.1+20.04.2",
            "status": "unaffected"
          }
        ],
        "lessThan": "2.45.1ubuntu0.2",
        "status": "affected",
        "version": "2.45.1",
        "versionType": "custom"
      }
    ]
  }
]