CVE-2022-42475: FortiOS – Heap-Based Buffer Overflow in sslvpnd

Fortinet has issued emergency patches for a severe pre-auth RCE vulnerability (CVE-2022-42475) affecting its FortiOS SSL-VPN product that is being actively exploited in the wild.

A heap-based buffer overflow vulnerability in FortiOS SSL-VPN may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.

Please immediately validating your systems against the following indicators of compromise:

Multiple log entries with:

Logdesc=”Application crashed” and msg=”[…] application:sslvpnd,[…], Signal 11 received, Backtrace: […]“

Presence of the following artifacts in the filesystem:

/data/lib/libips.bak

/data/lib/libgif.so

/data/lib/libiptcp.so

/data/lib/libipudp.so

/data/lib/libjepg.so

/var/.sslvpnconfigbk

/data/etc/wxd.conf

/flash

Connections to suspicious IP addresses from the FortiGate:

188.34.130.40:444

103.131.189.143:30080,30081,30443,20443

192.36.119.61:8443,444

172.247.168.153:8033

Affected Devices:

FortiOS version 7.2.0 through 7.2.2

FortiOS version 7.0.0 through 7.0.8

FortiOS version 6.4.0 through 6.4.10

FortiOS version 6.2.0 through 6.2.11

FortiOS-6K7K version 7.0.0 through 7.0.7

FortiOS-6K7K version 6.4.0 through 6.4.9

FortiOS-6K7K version 6.2.0 through 6.2.11

FortiOS-6K7K version 6.0.0 through 6.0.14

Kindly proceed with the following patches

Please upgrade to FortiOS version 7.2.3 or above

Please upgrade to FortiOS version 7.0.9 or above

Please upgrade to FortiOS version 6.4.11 or above

Please upgrade to FortiOS version 6.2.12 or above

Please upgrade to FortiOS-6K7K version 7.0.8 or above

Please upgrade to FortiOS-6K7K version 6.4.10 or above

Please upgrade to FortiOS-6K7K version 6.2.12 or above

Please upgrade to FortiOS-6K7K version 6.0.15 or above

References:

https://www.fortiguard.com/psirt/FG-IR-22-398