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

1) Out-of-bounds read

EUVDB-ID: #VU22480

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-9638

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 in the EXIF component within exif_process_IFD_in_MAKERNOTE when converting maker_note->offset relationship to value_len. A remote attacker can trigger an 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): 7.1.17-r0 - 7.2.13-r0

CPE2.3

• cpe:2.3:o:alpine:php7_alpine_package:7.1.17-r0:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:o:alpine:php7_alpine_package:7.1.30-r0:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:o:alpine:php7_alpine_package:7.1.32-r0:*:*:*:*:alpine_linux:*:3.7

External links

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