Input validation error in apache2 (Alpine package)

1) Input validation error

EUVDB-ID: #VU32549

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-6438

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The dav_xml_get_cdata function in main/util.c in the mod_dav module in the Apache HTTP Server before 2.4.8 does not properly remove whitespace characters from CDATA sections, which allows remote attackers to cause a denial of service (daemon crash) via a crafted DAV WRITE request.

Mitigation

Install update from vendor's website.

Vulnerable software versions

apache2 (Alpine package): 2.2.25-r0

CPE2.3

• cpe:2.3:a:alpine:apache2_alpine_package:2.2.25-r0:*:*:*:*:alpine_linux:*:2.3

External links

https://git.alpinelinux.org/aports/commit/?id=83628e2c6a82bbb3e9b36cec3d903d7004e90c5d
https://git.alpinelinux.org/aports/commit/?id=78e0a593413a5ed7449a690ec8c07fc81cf48362
https://git.alpinelinux.org/aports/commit/?id=6499c73a4c09c49fabf2c744656defc5b0f7aa96
https://git.alpinelinux.org/aports/commit/?id=96c84fd65048e19eb1259c5a8d21225029386f7d

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.