Vulnerability Name:

CVE-2019-19234 (CCN-173555)

Assigned:2019-11-22
Published:2019-11-22
Updated:2020-01-30
Summary:** 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 user--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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
7.5 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
6.5 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
8.5 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-noinfo
CWE-284
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-19234

Source: CONFIRM
Type: UNKNOWN
https://access.redhat.com/security/cve/cve-2019-19234

Source: XF
Type: UNKNOWN
sudo-cve201919234-sec-bypass(173555)

Source: FEDORA
Type: UNKNOWN
FEDORA-2020-7c1b270959

Source: FEDORA
Type: UNKNOWN
FEDORA-2020-8b563bc5f4

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979

Source: MISC
Type: UNKNOWN
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748

Source: CONFIRM
Type: UNKNOWN
https://security.netapp.com/advisory/ntap-20200103-0004/

Source: CONFIRM
Type: UNKNOWN
https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-19234

Source: MISC
Type: UNKNOWN
https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1018-5505

Source: MISC
Type: UNKNOWN
https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1019-3816

Source: MISC
Type: UNKNOWN
https://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html

Source: CCN
Type: IBM Security Bulletin 7008449 (Db2 on Cloud Pak for Data)
Multiple vulnerabilities affect IBM Db2 on Cloud Pak for Data and Db2 Warehouse on Cloud Pak for Data

Source: CONFIRM
Type: UNKNOWN
https://www.oracle.com/security-alerts/bulletinapr2020.html

Source: CCN
Type: Sudo Web site
Sudo Development Releases

Source: CONFIRM
Type: Vendor Advisory
https://www.sudo.ws/devel.html#1.8.30b2

Source: MISC
Type: Vendor Advisory
https://www.sudo.ws/stable.html

Source: CONFIRM
Type: UNKNOWN
https://www.suse.com/security/cve/CVE-2019-19234/

Source: MISC
Type: UNKNOWN
https://www.tenable.com/plugins/nessus/132985

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-19234

Vulnerable Configuration:Configuration 1:
  • cpe:/a:sudo:sudo:*:*:*:*:*:*:*:* (Version <= 1.8.29)

    • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:todd_miller:sudo:1.8.29:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20201804
    P
    		RHSA-2020:1804: sudo security, bug fix, and enhancement update (Moderate)
    2020-04-28
    oval:com.ubuntu.disco:def:2019192340000000
    V
    		CVE-2019-19234 on Ubuntu 19.04 (disco) - low.
    2019-12-19
    oval:com.ubuntu.bionic:def:2019192340000000
    V
    		CVE-2019-19234 on Ubuntu 18.04 LTS (bionic) - low.
    2019-12-19
    oval:com.ubuntu.xenial:def:2019192340000000
    V
    		CVE-2019-19234 on Ubuntu 16.04 LTS (xenial) - low.
    2019-12-19
    BACK
    sudo sudo *
    todd_miller sudo 1.8.29