CVE-2023-5824 Squid: dos against http and https
An attacker can cause a denial of service in Squid by triggering a crash or stall when large cached HTTP headers are retrieved from disk.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-5824?
CVE-2023-5824 is a high-severity denial of service vulnerability in Redhat Enterprise Linux, published on 3 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.
Weakness: CWE-755
Which versions are affected by CVE-2023-5824?
It affects 2 products.
Linux distribution packages (8)
libecap AlmaLinux:8 | All versions | 1.0.1-2.module_el8.6.0+2741+01592ae8 |
libecap AlmaLinux:8 | All versions | 1.0.1-2.module_el8.6.0+3048+383bc947 |
libecap-devel AlmaLinux:8 | All versions | 1.0.1-2.module_el8.6.0+2741+01592ae8 |
libecap-devel AlmaLinux:8 | All versions | 1.0.1-2.module_el8.6.0+3048+383bc947 |
squid AlmaLinux:8 | All versions | 7:4.15-7.module_el8.9.0+3696+b881db49.3 |
squid AlmaLinux:9 | All versions | 7:5.5-6.el9_3.2 |
libecap Rocky Linux:8 | All versions | 0:1.0.1-2.module+el8.9.0+1437+df5ea8f0 |
squid Rocky Linux:8 | All versions | 7:4.15-7.module+el8.9.0+1568+6d4fd5d4.1 |
Products include Redhat Enterprise Linux, Squid-Cache Squid.
How do I fix CVE-2023-5824?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-5824 being exploited?
There is no known exploitation of CVE-2023-5824 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection
- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as ALSA-2023:7465, ALSA-2023:7668, AZL-31904, AZL-63100, CLSA-2024-1730369054, CLSA-2024-1730480855 and 9 more.