Out-of-bounds read in php7 (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU22475

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9020

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the xml_elem_parse_buf() in ext/xmlrpc/libxmlrpc/xml_element.c when reading XML data via the xmlrpc_decode() PHP function. A remote attacker can create a specially crafted XML file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.2.13-r0 - 7.2.16-r1

CPE2.3

• cpe:2.3:o:alpine:php7_alpine_package:7.2.14-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:php7_alpine_package:7.2.15-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:php7_alpine_package:7.2.15-r1:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=ebcd3398f2d6e6f536fbfeaba9cc3b84ac377251
http://git.alpinelinux.org/aports/commit/?id=583c0d55e9e7208425dd53eb1739a7010b6b0dbc
http://git.alpinelinux.org/aports/commit/?id=7c1daf27a04307093cef0fcb3f1c5ab4bb68eee1

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.