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CVE-2023-46728

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6500-2
Posted Dec 11, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6500-2 - USN-6500-1 fixed several vulnerabilities in Squid. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Joshua Rogers discovered that Squid incorrectly handled the Gopher protocol. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Gopher support has been disabled in this update.

tags | advisory, remote, denial of service, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2023-46728, CVE-2023-46847
SHA-256 | 68a0cfeb1732f51717395adcb7e4d77d2b664517f161aa855e01969edfb3dce4
Ubuntu Security Notice USN-6500-1
Posted Nov 22, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6500-1 - Joshua Rogers discovered that Squid incorrectly handled validating certain SSL certificates. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. Joshua Rogers discovered that Squid incorrectly handled the Gopher protocol. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Gopher support has been disabled in this update. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04.

tags | advisory, remote, denial of service, protocol
systems | linux, ubuntu
advisories | CVE-2023-46724, CVE-2023-46728, CVE-2023-46846, CVE-2023-46847, CVE-2023-46848
SHA-256 | 89e080ec0dca666e58acac5a17ad942076e2d2723e487a8ff043ca16623f5d78
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