Input validation error in apache2 (Alpine package)

1) Input validation error

EUVDB-ID: #VU32825

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-0021

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache2 (Alpine package): 2.2.21-r0 - 2.2.21-r3

CPE2.3

• cpe:2.3:o:alpine:apache2_alpine_package:2.2.21-r0:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:apache2_alpine_package:2.2.21-r1:*:*:*:*:alpine_linux:*:2.1
• cpe:2.3:o:alpine:apache2_alpine_package:2.2.21-r2:*:*:*:*:alpine_linux:*:2.1

External links

https://git.alpinelinux.org/aports/commit/?id=eb6bfe8b9093524e7eeeb50630c0dd0921880764
https://git.alpinelinux.org/aports/commit/?id=271ab41139ec89734cef1524dfc916f489708e9f
https://git.alpinelinux.org/aports/commit/?id=400a302e8bca4ad2bbef3bb38737680ef8fb53cd

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.