Suricata up to 4.0.5 SMTP Parser util-decode-mime.c ProcessMimeEntity input validation

EntryHistoryDiffjsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

A vulnerability was found in Suricata up to 4.0.5. It has been declared as problematic. This vulnerability affects the function ProcessMimeEntity of the file util-decode-mime.c of the component SMTP Parser. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

The ProcessMimeEntity function in util-decode-mime.c in Suricata 4.x through 4.0.5 allows remote attackers to cause a denial of service (segfault and daemon crash) via crafted input to the SMTP parser, as exploited in the wild in November 2018.

The bug was discovered 11/06/2018. The weakness was released 11/05/2018 (Website). The advisory is available at lists.openinfosecfoundation.org. This vulnerability was named CVE-2018-18956 since 11/05/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a private exploit are known.

After even before and not, there has been an exploit disclosed. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 119020 (Fedora 27 : suricata (2018-d05860129f)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (119020).

Productinfo

Name

Suricata

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

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

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Highly functional

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Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 119020
Nessus Name: Fedora 27 : suricata (2018-d05860129f)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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0-Day Time: 🔍
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Timelineinfo

11/01/2018 🔍
11/05/2018 +4 days 🔍
11/05/2018 +0 days 🔍
11/05/2018 +0 days 🔍
11/06/2018 +1 days 🔍
11/06/2018 +0 days 🔍
11/17/2018 +11 days 🔍
11/19/2018 +2 days 🔍
06/04/2023 +1658 days 🔍

Sourcesinfo

Advisory: FEDORA-2018-d05860129f
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-18956 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/06/2018 08:33
Updated: 06/04/2023 15:03
Changes: 11/06/2018 08:33 (73), 04/10/2020 09:50 (4), 06/04/2023 15:01 (4), 06/04/2023 15:03 (1)
Complete: 🔍