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Debian Security Bug TrackerDEBIANCVE:CVE-2021-40084

HistoryAug 25, 2021 - 1:15 a.m.

CVE-2021-40084

2021-08-2501:15:12

Debian Security Bug Tracker

security-tracker.debian.org

opensysusers

security

vulnerability

command execution

gecos field

sysusers.

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.005

Percentile

75.8%

JSON

opensysusers through 0.6 does not safely use eval on files in sysusers.d that may contain shell metacharacters. For example, it allows command execution via a crafted GECOS field whereas systemd-sysusers (a program with the same specification) does not do that.

OSVersionArchitecturePackageVersionFilename
Debian12allopensysusers< 0.6-3opensysusers_0.6-3_all.deb
Debian11allopensysusers<= 0.6-2opensysusers_0.6-2_all.deb
Debian999allopensysusers< 0.6-3opensysusers_0.6-3_all.deb

OS	Version	Architecture	Package	Version	Filename
Debian	12	all	opensysusers	< 0.6-3	opensysusers_0.6-3_all.deb
Debian	11	all	opensysusers	<= 0.6-2	opensysusers_0.6-2_all.deb
Debian	999	all	opensysusers	< 0.6-3	opensysusers_0.6-3_all.deb

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.005

Percentile

75.8%

JSON

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