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AUSCERT External Security Bulletin Redistribution
ESB-2019.3951
FreeBSD
25 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: sudo
Publisher: FreeBSD
Operating System: FreeBSD
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-14287
Reference: ESB-2019.3901
ESB-2019.3839
ESB-2019.3826
Original Bulletin:
http://www.vuxml.org/freebsd/3a1474ba-f646-11e9-b0af-b888e347c638.html
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FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports
Collection
sudo -- Potential bypass of Runas user restrictions
Affected packages
sudo < 1.8.28
Details
VuXML ID 3a1474ba-f646-11e9-b0af-b888e347c638
Discovery 2019-10-15
Entry 2019-10-24
Todd C. Miller reports:
When sudo is configured to allow a user to run commands as an arbitrary
user via the ALL keyword in a Runas specification, it is possible to run
commands as root by specifying the user ID -1 or 4294967295.
This can be used by a user with sufficient sudo privileges to run commands
as root even if the Runas specification explicitly disallows root access as
long as the ALL keyword is listed first in the Runas specification.
Log entries for commands run this way will list the target user as
4294967295 instead of root. In addition, PAM session modules will not be
run for the command.
[source]
References
CVE Name CVE-2019-14287
URL https://www.sudo.ws/alerts/minus_1_uid.html
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===========================================================================
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The University of Queensland
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