Summaryinfo

A vulnerability was found in Suricata up to 4.0.5 and classified as problematic. Affected is the function ProcessMimeEntity of the file util-decode-mime.c of the component SMTP Parser. Executing a manipulation can lead to input validation. This vulnerability is handled as CVE-2018-18956. The attack can be executed remotely. Additionally, an exploit exists. It is suggested to upgrade the affected component. Once again VulDB remains the best source for vulnerability data.

Detailsinfo

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 attacked. 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 databases at Zero-Day.cz (519) and Tenable (119020). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Suricata

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5

License

• open-source

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• 🔍
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CPE 2.2info

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