High
CVE-2020-7460
CVE ID
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CVE-2020-7460
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 12.1-STABLE before r363918, 12.1-RELEASE before p8, 11.4-STABLE before r363919, 11.4-RELEASE before p2, and 11.3-RELEASE before p12, the sendmsg system call in the compat32 subsystem on 64-bit platforms has a time-of-check to time-of-use vulnerability allowing a mailcious userspace program to modify control message headers after they were validation.
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Ratings
-
Attacker ValueHigh
-
ExploitabilityMedium
Technical Analysis
Seems to be a reliable though somewhat elaborate LPE on all 64-bit FreeBSD kernels since 2014.
Though FBSD may not be as common as (GNU/)Linux, I’ve seen it used as an appliance base by certain vendors. The OS doesn’t always get patched in those cases.
ETA: Looks like it has the potential to crash even exploitable systems, but it is a kernel heap memory corruption.
$ ./exploit [+] Starting wrecker [+] Wrecker ready [+] Starting executor [+] Waiting... [+] Winner 1 [+] Winner 2 [+] Magic found # id uid=0(root) gid=0(wheel) egid=1001(user) groups=1001(user) # uname -a FreeBSD 12.1-RELEASE FreeBSD 12.1-RELEASE r354233 GENERIC amd64 #
Otherwise working.
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General Information
Vendors
- freebsd
Products
- freebsd 11.3,
- freebsd 11.4,
- freebsd 12.1
References
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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