VDB-126580 · CVE-2018-15443 · BID 105870

Cisco Firepower System Software Detection Engine TCP Connection Request resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Cisco Firepower System Software. It has been declared as critical. This vulnerability affects unknown code of the component Detection Engine. Executing a manipulation as part of TCP Connection Request can lead to resource consumption. This vulnerability is registered as CVE-2018-15443. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Cisco Firepower System Software (Firewall Software) (version now known) and classified as critical. This vulnerability affects some unknown processing of the component Detection Engine. The manipulation as part of a TCP Connection Request leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a configured Intrusion Prevention System (IPS) rule that inspects certain types of TCP traffic. The vulnerability is due to incorrect TCP retransmission handling. An attacker could exploit this vulnerability by sending a crafted TCP connection request through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.

The bug was discovered 11/07/2018. The weakness was published 11/08/2018 as cisco-sa-20181107-fde-tcp-bypa as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2018-15443 since 08/17/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/05/2023). The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 105870†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.8
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/17/2018 🔍
11/07/2018 +82 days 🔍
11/07/2018 +0 days 🔍
11/08/2018 +1 days 🔍
11/08/2018 +0 days 🔍
11/09/2018 +1 days 🔍
06/05/2023 +1669 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20181107-fde-tcp-bypa
Status: Confirmed

CVE: CVE-2018-15443 (🔍)
GCVE (CVE): GCVE-0-2018-15443
GCVE (VulDB): GCVE-100-126580
SecurityFocus: 105870 - Cisco Firepower System Software CVE-2018-15443 Security Bypass Vulnerability

Entryinfo

Created: 11/09/2018 07:43
Updated: 06/05/2023 09:39
Changes: 11/09/2018 07:43 (61), 04/11/2020 08:26 (3), 06/05/2023 09:39 (14)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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