CVE-2019-18634

Public Exploit

Description

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 87.27% Top 5%
Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory fedoraproject.org Vendor Advisory sudo.ws Vendor Advisory sudo.ws
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://support.apple.com/kb/HT210919 third party advisory
https://seclists.org/bugtraq/2020/Jan/44 third party advisory mailing list
https://www.sudo.ws/security.html vendor advisory
https://www.sudo.ws/alerts/pwfeedback.html vendor advisory exploit
http://www.openwall.com/lists/oss-security/2020/01/30/6 third party advisory mailing list
http://www.openwall.com/lists/oss-security/2020/01/31/1 third party advisory mailing list
http://seclists.org/fulldisclosure/2020/Jan/40 third party advisory mailing list
https://www.debian.org/security/2020/dsa-4614 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2020/02/msg00002.html third party advisory mailing list
https://seclists.org/bugtraq/2020/Feb/3 third party advisory mailing list
https://seclists.org/bugtraq/2020/Feb/2 third party advisory mailing list
http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html third party advisory vdb entry
http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html third party advisory vdb entry
http://www.openwall.com/lists/oss-security/2020/02/05/2 third party advisory mailing list
http://www.openwall.com/lists/oss-security/2020/02/05/5 mailing list third party advisory exploit
https://usn.ubuntu.com/4263-1/ vendor advisory
https://security.netapp.com/advisory/ntap-20200210-0001/
https://usn.ubuntu.com/4263-2/ vendor advisory
https://access.redhat.com/errata/RHSA-2020:0487 vendor advisory
https://access.redhat.com/errata/RHSA-2020:0509 vendor advisory
https://access.redhat.com/errata/RHSA-2020:0540 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00029.html vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/ vendor advisory
https://access.redhat.com/errata/RHSA-2020:0726 vendor advisory
https://security.gentoo.org/glsa/202003-12 vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-18634?
CVE-2019-18634 has been scored as a high severity vulnerability.
How to fix CVE-2019-18634?
To fix CVE-2019-18634, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-18634 being actively exploited in the wild?
It is possible that CVE-2019-18634 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~87% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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