Summary
Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don't have to create the same web page over and over again, giving the website a significant speed up.
Security Fix(es):
* HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack) (CVE-2023-44487)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 6
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | varnish | 6.0.8-3.module_el8.8.0+3665+0b8dabc5.1.alma.1 |
| AlmaLinux · 8 | varnish-devel | 6.0.8-3.module_el8.8.0+3665+0b8dabc5.1.alma.1 |
| AlmaLinux · 8 | varnish-docs | 6.0.8-3.module_el8.8.0+3665+0b8dabc5.1.alma.1 |
| AlmaLinux · 8 | varnish-modules | 0.15.0-6.module_el8.5.0+2620+03a0c2cc |
| AlmaLinux · 8 | varnish-modules | 0.15.0-6.module_el8.5.0+76+a10ffa55 |
| AlmaLinux · 8 | varnish-modules | 0.15.0-6.module_el8.6.0+3089+dac88e97 |
Vulnerabilities 1
-
High 7.5
HTTP/2 Stream Cancellation Attack
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
KEV Oct 10, 2023