F5 BIG-IP up to 13.1.0.5 FastL4 Virtual Server TCP Packets input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in F5 BIG-IP up to 13.1.0.5. It has been rated as problematic. Affected by this issue is some unknown functionality of the component FastL4 Virtual Server. Performing a manipulation as part of TCP Packets results in input validation. This vulnerability is reported as CVE-2018-5517. The attack is possible to be carried out remotely. No exploit exists. It is suggested to use restrictive firewalling.

Detailsinfo

A vulnerability, which was classified as problematic, was found in F5 BIG-IP up to 13.1.0.5 (Firewall Software). This affects an unknown function of the component FastL4 Virtual Server. The manipulation as part of a TCP Packets leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

On F5 BIG-IP 13.1.0-13.1.0.5, malformed TCP packets sent to a self IP address or a FastL4 virtual server may cause an interruption of service. The control plane is not exposed to this issue. This issue impacts the data plane virtual servers and self IPs.

The bug was discovered 05/01/2018. The weakness was disclosed 05/02/2018 (Website). It is possible to read the advisory at support.f5.com. This vulnerability is uniquely identified as CVE-2018-5517 since 01/12/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/08/2023).

The vulnerability scanner Nessus provides a plugin with the ID 118646 (F5 Networks BIG-IP : TMM vulnerability (K25573437)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370961 (F5 BIG-IP ASM TMM Multiple Disruption of Service Vulnerabilities (K25573437, K45320419, K51754851)).

It is possible to mitigate the weakness by firewalling . A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (118646) and SecurityFocus (BID 104097†). The entries VDB-117323 and VDB-117324 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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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Nessus ID: 118646
Nessus Name: F5 Networks BIG-IP : TMM vulnerability (K25573437)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/12/2018 🔍
04/30/2018 +108 days 🔍
05/01/2018 +1 days 🔍
05/01/2018 +0 days 🔍
05/02/2018 +0 days 🔍
05/02/2018 +0 days 🔍
05/03/2018 +1 days 🔍
11/02/2018 +183 days 🔍
03/08/2023 +1587 days 🔍

Sourcesinfo

Vendor: f5.com

Advisory: K25573437
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-5517 (🔍)
GCVE (CVE): GCVE-0-2018-5517
GCVE (VulDB): GCVE-100-117327
SecurityFocus: 104097 - F5 BIG-IP CVE-2018-5514 Remote Denial of Service Vulnerability
SecurityTracker: 1040805

See also: 🔍

Entryinfo

Created: 05/03/2018 10:36
Updated: 03/08/2023 14:59
Changes: 05/03/2018 10:36 (66), 02/02/2020 09:43 (9), 03/08/2023 14:59 (5)
Complete: 🔍
Cache ID: 216::103

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