PHP up to 7.1.24 var_unserializer.c input validation

Summaryinfo

A vulnerability described as problematic has been identified in PHP up to 7.1.24. This impacts an unknown function of the file ext/standard/var_unserializer.c. Executing a manipulation can lead to input validation. This vulnerability appears as CVE-2018-19396. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in PHP up to 7.1.24 (Programming Language Software) and classified as problematic. This vulnerability affects an unknown code block of the file ext/standard/var_unserializer.c. 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:

ext/standard/var_unserializer.c in PHP 5.x through 7.1.24 allows attackers to cause a denial of service (application crash) via an unserialize call for the com, dotnet, or variant class.

The bug was discovered 11/19/2018. The weakness was presented 11/20/2018 (Website). The advisory is shared for download at securityfocus.com. This vulnerability was named CVE-2018-19396 since 11/20/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 06/11/2023).

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 105989†). See VDB-127047 for similar entry. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Programming Language Software

Name

• PHP

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9
• 7.1.10
• 7.1.11
• 7.1.12
• 7.1.13
• 7.1.14
• 7.1.15
• 7.1.16
• 7.1.17
• 7.1.18
• 7.1.19
• 7.1.20
• 7.1.21
• 7.1.22
• 7.1.23
• 7.1.24

License

• open-source

Website

• Product: https://www.php.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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