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

1) Out-of-bounds read

EUVDB-ID: #VU18379

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-2019-11034

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 exif_process_IFD_TAG() function in PHP EXIF extension when processing certain files. An attacker can pass a specially crafted file to the application,  trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.1.17-r0 - 7.2.17-r0

CPE2.3

• cpe:2.3:o:alpine:php7_alpine_package:7.2.4-r0:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:php7_alpine_package:7.2.4-r1:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:php7_alpine_package:7.2.6-r0:*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=1ebb8b4ced83d80d32fbce55699c5d9d388f9e5d
http://git.alpinelinux.org/aports/commit/?id=9be2eb40f99ced1e46b89f77390a73f70d0ac5d2
http://git.alpinelinux.org/aports/commit/?id=88eca856b3813d00e3184daba896baacadfe5837
http://git.alpinelinux.org/aports/commit/?id=d42b915a2245405763bb485ededfbdb01393f109

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.