Squid Web Proxy up to 6.0.0 Gopher Gateway null pointer dereference

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 Squid Web Proxy up to 6.0.0. It has been rated as problematic. The impacted element is an unknown function of the component Gopher Gateway. The manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2023-46728. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Squid Web Proxy up to 6.0.0 (Firewall Software). This issue affects an unknown function of the component Gopher Gateway. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.

The weakness was shared 11/06/2023. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-46728 since 10/25/2023. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 236724 (Alibaba Cloud Linux 3 : 0020: squid:4 (ALINUX3-SA-2024:0020)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236724). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

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: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 236724
Nessus Name: Alibaba Cloud Linux 3 : 0020: squid:4 (ALINUX3-SA-2024:0020)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Web Proxy 6.0.1
Patch: github.com

Timelineinfo

10/25/2023 🔍
11/06/2023 +12 days 🔍
11/06/2023 +0 days 🔍
05/16/2025 +557 days 🔍

Sourcesinfo

Vendor: squid-cache.org

Advisory: 6ea12e8fb590ac6959e9356a81aa3370576568c3
Status: Confirmed

CVE: CVE-2023-46728 (🔍)
GCVE (CVE): GCVE-0-2023-46728
GCVE (VulDB): GCVE-100-244559

Entryinfo

Created: 11/06/2023 19:08
Updated: 05/16/2025 18:03
Changes: 11/06/2023 19:08 (50), 12/02/2023 14:43 (2), 12/02/2023 14:46 (1), 05/16/2025 18:03 (17)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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