Resource management error in apache2 (Alpine package)

1) Resource management error

EUVDB-ID: #VU35854

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-11993

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application while processing HTTP/2 requests with enabled trace/debug for HTTP/2 connections. A remote attacker can send specially crafted HTTP/2 requests to Apache HTTP Server and force it to make logging statements on wrong connection for certain traffic edge patterns. This results in concurrent use of memory pools for separate connections and triggers denial of service condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache2 (Alpine package): 2.4.4-r0 - 2.4.46-r0

apache2 (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:apache2_alpine_package:2.4.4-r0:*:*:*:*:alpine_linux:*:2.5
• cpe:2.3:o:alpine:apache2_alpine_package:2.4.4-r1:*:*:*:*:alpine_linux:*:2.5
• cpe:2.3:o:alpine:apache2_alpine_package:2.4.6-r0:*:*:*:*:alpine_linux:*:2.5
• cpe:2.3:o:alpine:apache2_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=797390cbb6c440259617ae2b00c29e290c8f2cf4

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.