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ubuntucveUbuntu.comUB:CVE-2021-41617
HistorySep 26, 2021 - 12:00 a.m.

CVE-2021-41617

2021-09-2600:00:00
ubuntu.com
ubuntu.com
363
openssh
privilege escalation
configurations

CVSS2

4.4

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.001

Percentile

27.7%

JSON

sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default
configurations are used, allows privilege escalation because supplemental
groups are not initialized as expected. Helper programs for
AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with
privileges associated with group memberships of the sshd process, if the
configuration specifies running the command as a different user.

Bugs

Notes

Author Note
Priority reason: Cannot be reproduced on Ubuntu since sshd drops groups early
seth-arnold openssh-ssh1 is provided for compatibility with old devices that cannot be upgraded to modern protocols. Thus we may not provide security support for this package if doing so would prevent access to equipment.
mdeslaur Only applies to non-default configurations where AuthorizedKeysCommand or AuthorizedPrincipalsCommand are used.
sespiros Cannot reproduce since sshd for all releases drops supplementary groups early when it starts with setgroups(0, NULL).

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CVSS2

4.4

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.001

Percentile

27.7%

JSON
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