Very High
CVE-2019-5596
CVE ID
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CVE-2019-5596
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
In FreeBSD 11.2-STABLE after r338618 and before r343786, 12.0-STABLE before r343781, and 12.0-RELEASE before 12.0-RELEASE-p3, a bug in the reference count implementation for UNIX domain sockets can cause a file structure to be incorrectly released potentially allowing a malicious local user to gain root privileges or escape from a jail.
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Ratings
-
Attacker ValueVery High
-
ExploitabilityVery Low
Technical Analysis
Exploitation of this vulnerability is temperamental at least, destructive at most. While triggering the exploit, it seems somewhat dependent on a higher than default kern.maxfiles. If maxfiles is set too low, the box will reboot.
If exploitation is successful, in order to cause the RCE, /etc/libmap.confis altered. If the original one is not restored, the box is bricked since it attempts to call the payload which was most likely deleted once run.
Exploitation can take between 20-70 minutes.
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General Information
Vendors
- freebsd
Products
- freebsd 11.2,
- freebsd 12.0
References
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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