Fortinet FortiOS/FortiProxy FortiGate SSL-VPN heap-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.7$25k-$100k0.00

Summaryinfo

A vulnerability, which was classified as very critical, was found in Fortinet FortiOS and FortiProxy. Affected is an unknown function of the component FortiGate SSL-VPN. Such manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2023-27997. The attack can be executed remotely. Additionally, an exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiOS and FortiProxy (Firewall Software) (affected version not known) and classified as very critical. Affected by this issue is some unknown functionality of the component FortiGate SSL-VPN. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability.

The weakness was released 06/13/2023 as FG-IR-23-097. The advisory is shared for download at fortiguard.com. This vulnerability is handled as CVE-2023-27997 since 03/09/2023. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $25k-$100k (estimation calculated on 10/25/2024).

It is declared as attacked. As 0-day the estimated underground price was around $25k-$100k. This issue was added on 06/13/2023 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 07/04/2023:

Apply updates per vendor instructions.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Zero-Day.cz (777). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Vendor

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (Fortinet, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Zero-Day.cz: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/09/2023 🔍
06/13/2023 +95 days 🔍
06/13/2023 +0 days 🔍
10/25/2024 +500 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-23-097
Status: Confirmed

CVE: CVE-2023-27997 (🔍)
GCVE (CVE): GCVE-0-2023-27997
GCVE (VulDB): GCVE-100-231296
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/13/2023 10:27
Updated: 10/25/2024 07:52
Changes: 06/13/2023 10:27 (39), 07/08/2023 14:12 (1), 07/08/2023 14:16 (11), 04/28/2024 20:01 (26), 06/10/2024 20:53 (2), 06/28/2024 02:28 (10), 09/09/2024 22:30 (2), 10/25/2024 07:52 (1)
Complete: 🔍
Cache ID: 216:00A:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

 misc (+0)
3 years ago
Python script to check if a service is vulnerable: https://github.com/BishopFox/CVE-2023-27997-check

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