Remote code execution in FortiOS and FortiProxy captive portal
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-42789 CVE-2023-42790 |
| CWE-ID | CWE-787 CWE-121 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
FortiOS Operating systems & Components / Operating system FortiProxy Hardware solutions / Routers & switches, VoIP, GSM, etc |
| Vendor | Fortinet, Inc |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU87497
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42789
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in captive portal. A remote attacker can send specially crafted HTTP requests to the affected device, trigger an out-of-bounds write and execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsFortiOS: 6.2.0 - 7.4.1
FortiProxy: 2.0.0 - 7.4.0
External linkshttp://fortiguard.com/psirt/FG-IR-23-328
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Stack-based buffer overflow
EUVDB-ID: #VU87498
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-42790
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing specially crafted HTTP requests in captive portal. A remote unauthenticated attacker can trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsFortiOS: 6.2.12 - 7.4.1
FortiProxy: 2.0.10 - 7.4.0
External linkshttp://fortiguard.com/psirt/FG-IR-23-327
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
