Fortinet FortiOS up to 6.2.1 ECDSA PRNG entropy

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Fortinet FortiOS up to 6.2.1. It has been rated as critical. This issue affects some unknown processing of the component ECDSA Handler. The manipulation leads to entropy (PRNG). This vulnerability is uniquely identified as CVE-2019-15703. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Fortinet FortiOS up to 6.2.1 (Firewall Software). This issue affects an unknown function of the component ECDSA Handler. The manipulation with an unknown input leads to a entropy vulnerability (PRNG). Using CWE to declare the problem leads to CWE-331. The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. Impacted is confidentiality. The summary by CVE is:

An Insufficient Entropy in PRNG vulnerability in Fortinet FortiOS 6.2.1 and below for device not enable hardware TRNG token and models not support builtin TRNG seed allows attacker to theoretically recover the long term ECDSA secret in a TLS client with a RSA handshake and mutual ECDSA authentication via the help of flush+reload side channel attacks in FortiGate VM models only.

The weakness was disclosed 10/24/2019 as FG-IR-19-186 (Website). The advisory is shared at fortiguard.com. The identification of this vulnerability is CVE-2019-15703 since 08/27/2019. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1600.001 for this issue.

Upgrading eliminates this vulnerability.

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Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: PRNG
Class: Entropy / PRNG
CWE: CWE-331 / CWE-330 / CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/27/2019 🔍
10/24/2019 +58 days 🔍
10/25/2019 +1 days 🔍
10/25/2019 +0 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-19-186
Status: Confirmed

CVE: CVE-2019-15703 (🔍)
GCVE (CVE): GCVE-0-2019-15703
GCVE (VulDB): GCVE-100-144137

Entryinfo

Created: 10/25/2019 06:54
Updated: 10/25/2019 06:59
Changes: 10/25/2019 06:54 (42), 10/25/2019 06:59 (18)
Complete: 🔍
Cache ID: 216::103

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