Use-after-free in apache2 (Alpine package)

1) Use-after-free

EUVDB-ID: #VU18109

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-2019-0196

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the mod_http2 module when processing HTTP/2 requests. A remote attacker can make the application to access freed memory during string comparison when determining the method of a request and process the request incorrectly.

Successful exploitation of the vulnerability may allow an attacker to gain access to sensitive information or perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache2 (Alpine package): 2.4.23-r0 - 2.4.38-r3

CPE2.3

• cpe:2.3:a:alpine:apache2_alpine_package:2.4.23-r0:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:apache2_alpine_package:2.4.23-r1:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:apache2_alpine_package:2.4.23-r3:*:*:*:*:alpine_linux:*:3.3

External links

https://git.alpinelinux.org/aports/commit/?id=2352aedda7b946046e3bb408f94d6053f6468d74
https://git.alpinelinux.org/aports/commit/?id=f69ef91711a9edd270c57081b8cd8230ad8fed24
https://git.alpinelinux.org/aports/commit/?id=0342bb148db2b28dcced8a4c5b8e2840f3af9a44
https://git.alpinelinux.org/aports/commit/?id=9d23763439dabef4a81c7cc9c061b69048df9708
https://git.alpinelinux.org/aports/commit/?id=bbf41c02f848c8e5967bd857c6988274dc55f068
https://git.alpinelinux.org/aports/commit/?id=ef86fbabe1c2c14cf06d8c26c6141b650e92049d

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.