Vulnerability · Published Nov 6, 2023 · Assigned by GitHub_M
CVE-2023-46728SQUID-2021:8 Denial of Service in Gopher gateway
High 7.5
In plain English
A high-severity null pointer dereference in squid from squid-cache. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.0% (higher than 93% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | libecap | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2024:0046 |
| AlmaLinux:8 | libecap | 1.0.1-2.module_el8.6.0+3048+383bc947 | ALSA-2024:0046 |
| AlmaLinux:8 | libecap-devel | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2024:0046 |
| AlmaLinux:8 | libecap-devel | 1.0.1-2.module_el8.6.0+3048+383bc947 | ALSA-2024:0046 |
| AlmaLinux:8 | squid | 7:4.15-7.module_el8.9.0+3708+6acaac63.5 | ALSA-2024:0046 |
| AlmaLinux:9 | squid | 7:5.5-6.el9_3.5 | ALSA-2024:0071 |
| Debian:12 | squid | 5.7-2+deb12u5 | DEBIAN-CVE-2023-46728 |
| Debian:13 | squid | 6.1-1 | DEBIAN-CVE-2023-46728 |
| Debian:14 | squid | 6.1-1 | DEBIAN-CVE-2023-46728 |
| Rocky Linux:8 | libecap | 0:1.0.1-2.module+el8.9.0+1437+df5ea8f0 | RLSA-2024:0046 |
| Rocky Linux:8 | squid | 7:4.15-7.module+el8.9.0+1568+6d4fd5d4.1 | RLSA-2024:0046 |
| Ubuntu:22.04:LTS | squid | 5.7-0ubuntu0.22.04.2 | USN-6500-1 |
| Ubuntu:22.04:LTS | squid | 5.7-0ubuntu0.22.04.2 | UBUNTU-CVE-2023-46728 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| squid-cache | squid | < 6.0.1 |
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f x_refsource_CONFIRM
- https://github.com/squid-cache/squid/commit/6ea12e8fb590ac6959e9356a81aa3370576568c3 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20231214-0006/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
- https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html