QID 43915

Date Published: 2022-10-17

QID 43915: FortiOS Integer Overflow Vulnerability in Secure Sockets Layer (SSL) Virtual Private Network (VPN) (SSLVPN) Allocator (FG-IR-21-049)

An integer overflow or wraparound vulnerability [CWE-190] in FortiOS SSLVPN memory allocator may allow an unauthenticated attacker to corrupt control data on the heap via specifically crafted requests to SSLVPN, resulting in potentially arbitrary code execution.

Affected Products:
Only when SSLVPN is enabled:
FortiOS version 7.0.0 and below
FortiOS version 6.4.5 and below
FortiOS version 6.2.9 and below
FortiOS version 6.0.12 and below

QID Detection Logic (Authenticated):
Detection checks for vulnerable version of FortiOS.

Note: Detection is made potential because, the signature doesn't check if SSLVPN is enabled on the host.

Vulnerable version of FortiOS may allow an unauthenticated attacker to corrupt control data on the heap via specifically crafted requests to SSLVPN, resulting in potentially arbitrary code execution.

CVSS V3 rated as Critical - 9.8 severity.

CVSS V2 rated as High - 7.5 severity.

Solution

Vendor has released fixes to address this vulnerability
For more details refer advisory FG-IR-21-049

Vendor References

FG-IR-21-049 - www.fortiguard.com/psirt/FG-IR-21-049

CVEs related to QID 43915

CVE-2021-26109 |

Software Advisories

Advisory ID	Software	Component	Link
FG-IR-21-049			www.fortiguard.com/psirt/FG-IR-21-049

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