Permissions, Privileges, and Access Controls in php (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32548

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-2013-7345

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The BEGIN regular expression in the awk script detector in magic/Magdir/commands in file before 5.15 uses multiple wildcards with unlimited repetitions, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted ASCII file that triggers a large amount of backtracking, as demonstrated via a file with many newline characters.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php (Alpine package): 5.2.12-r0 - 5.3.28-r1

CPE2.3

• cpe:2.3:o:alpine:php_alpine_package:5.2.12-r0:*:*:*:*:alpine_linux:*:1.9
• cpe:2.3:o:alpine:php_alpine_package:5.3.2-r4:*:*:*:*:alpine_linux:*:1.9
• cpe:2.3:o:alpine:php_alpine_package:5.3.2-r8:*:*:*:*:alpine_linux:*:1.9

External links

https://git.alpinelinux.org/aports/commit/?id=e9ac51136d63d809d055c24c4c69cf2a9d1bab04
https://git.alpinelinux.org/aports/commit/?id=f93dd45c5da8769af8106a3548729ec182db6a6d
https://git.alpinelinux.org/aports/commit/?id=3f507d9733ce2f29853c26ae0746e3ac2c16c90e

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.