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ubuntucveUbuntu.comUB:CVE-2019-19234
HistoryDec 19, 2019 - 12:00 a.m.

CVE-2019-19234

2019-12-1900:00:00
ubuntu.com
ubuntu.com
7

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.005 Low

EPSS

Percentile

76.9%

DISPUTED In Sudo through 1.8.29, the fact that a user has been
blocked (e.g., by using the ! character in the shadow file instead of a
password hash) is not considered, allowing an attacker (who has access to a
Runas ALL sudoer account) to impersonate any blocked user. NOTE: The
software maintainer believes that this CVE is not valid. Disabling local
password authentication for a user is not the same as disabling all access
to that userโ€“the user may still be able to login via other means (ssh key,
kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on
this. Indeed it is a valid use case to have local accounts that are only
accessible via sudo and that cannot be logged into with a password. Sudo
1.8.30 added an optional setting to check the shell of the target user
(not the encrypted password!) against the contents of /etc/shells but that
is not the same thing as preventing access to users with an invalid
password hash.

Bugs

Notes

Author Note
mdeslaur upstream sudo has disputed this CVE, sudo works as intended and as documented, so marking this as not-affected.
OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchsudo<ย 1.8.31-1ubuntu1UNKNOWN

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.005 Low

EPSS

Percentile

76.9%