8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:S/C:C/I:C/A:C
In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.
Recent assessments:
SherlockSec at March 09, 2020 8:43pm UTC reported:
This exploit is similar to CVE-2019-14287, in that it requires a specific config within /etc/sudoers
. Present in sudo versions < 1.8.26, this vuln surrounds the pwfeedback
option: an option that allows sudo to display asteriks when typing a sudo password. This module is susceptible to a buffer overflow attack, which was demonstrated in the following PoC:
$ perl -e 'print(("A" x 100 . "\x{00}") x 50)' | sudo -S id
Password: Segmentation fault
_Source – <https://www.exploit-db.com/exploits/47995>_
An exploit for this vuln can be found here – <https://github.com/saleemrashid/sudo-cve-2019-18634>
A preconfigured test environment can be found here – <https://tryhackme.com/room/sudovulnsbof>
wvu-r7 at February 03, 2020 7:40am UTC reported:
This exploit is similar to CVE-2019-14287, in that it requires a specific config within /etc/sudoers
. Present in sudo versions < 1.8.26, this vuln surrounds the pwfeedback
option: an option that allows sudo to display asteriks when typing a sudo password. This module is susceptible to a buffer overflow attack, which was demonstrated in the following PoC:
$ perl -e 'print(("A" x 100 . "\x{00}") x 50)' | sudo -S id
Password: Segmentation fault
_Source – <https://www.exploit-db.com/exploits/47995>_
An exploit for this vuln can be found here – <https://github.com/saleemrashid/sudo-cve-2019-18634>
A preconfigured test environment can be found here – <https://tryhackme.com/room/sudovulnsbof>
Assessed Attacker Value: 2
Assessed Attacker Value: 2Assessed Attacker Value: 5
lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html
packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html
packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html
seclists.org/fulldisclosure/2020/Jan/40
www.openwall.com/lists/oss-security/2020/01/30/6
www.openwall.com/lists/oss-security/2020/01/31/1
www.openwall.com/lists/oss-security/2020/02/05/2
www.openwall.com/lists/oss-security/2020/02/05/5
access.redhat.com/errata/RHSA-2020:0487
access.redhat.com/errata/RHSA-2020:0509
access.redhat.com/errata/RHSA-2020:0540
access.redhat.com/errata/RHSA-2020:0726
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18634
lists.debian.org/debian-lts-announce/2020/02/msg00002.html
lists.fedoraproject.org/archives/list/[email protected]/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F
lists.fedoraproject.org/archives/list/[email protected]/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC
seclists.org/bugtraq/2020/Feb/2
seclists.org/bugtraq/2020/Feb/3
seclists.org/bugtraq/2020/Jan/44
security.gentoo.org/glsa/202003-12
security.netapp.com/advisory/ntap-20200210-0001
support.apple.com/kb/HT210919
usn.ubuntu.com/4263-1
usn.ubuntu.com/4263-2
www.debian.org/security/2020/dsa-4614
www.sudo.ws/alerts/pwfeedback.html
www.sudo.ws/security.html
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:S/C:C/I:C/A:C