Snappy up to 1.4.1 Phar file_exists deserialization

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8.4$0-$5k0.00

A vulnerability was found in Snappy up to 1.4.1. It has been classified as critical. This affects the function file_exists of the component Phar Handler. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.4.2, Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the `file_exists()` function. If an attacker can upload files of any type to the server he can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution especially when snappy is used with frameworks with documented POP chains like Laravel/Symfony vulnerable developer code. If a user can control the output file from the `generateFromHtml()` function, it will invoke deserialization. This vulnerability is capable of remote code execution if Snappy is used with frameworks or developer code with vulnerable POP chains. It has been fixed in version 1.4.2.

The weakness was released 03/18/2023 as GHSA-gq6w-q6wh-jggc. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-28115 since 03/10/2023. Technical details are known, but no exploit is available.

Upgrading to version 1.4.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 1ee6360cbdbea5d09705909a150df7963a88efd6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Snappy 1.4.2
Patch: 1ee6360cbdbea5d09705909a150df7963a88efd6

Timelineinfo

03/10/2023 🔍
03/18/2023 +8 days 🔍
03/18/2023 +0 days 🔍
03/18/2023 +0 days 🔍

Sourcesinfo

Advisory: GHSA-gq6w-q6wh-jggc
Status: Confirmed

CVE: CVE-2023-28115 (🔍)

Entryinfo

Created: 03/18/2023 08:29
Changes: 03/18/2023 08:29 (53)
Complete: 🔍

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