Cross-site scripting in php7 (Alpine package)

1) Cross-site scripting

EUVDB-ID: #VU12327

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10547

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists in the phar_do_404() and phar_do_403() functions due to insufficient sanitization of user-supplied data processed by the phar_do_404() and phar_do_403() functions, as defined in the ext/phar/phar_object.c source code file. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

The vulnerability exists due to an incomplete fix for CVE-2018-5712.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.0.7-r0 - 7.1.17-r0

External links

http://git.alpinelinux.org/aports/commit/?id=d42b915a2245405763bb485ededfbdb01393f109
http://git.alpinelinux.org/aports/commit/?id=797bba4604043977849b0c0cf0b2ef7b21b1ea8c
http://git.alpinelinux.org/aports/commit/?id=38460e57f1f299ba2454aa7869c699f1ab333ca1

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.