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

1) Out-of-bounds read

EUVDB-ID: #VU23826

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-20021

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

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to potentially sensitive information.

The vulnerability exists due to a heap-based buffer over-read within the canUnpack() function in p_mach.cpp. An attacker can create a specially crafted Mach-O 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

upx (Alpine package): 3.95-r2 - 3.96-r0

CPE2.3

• cpe:2.3:o:alpine:upx_alpine_package:3.95-r2:*:*:*:*:alpine_linux:*:3.11
• cpe:2.3:o:alpine:upx_alpine_package:3.96-r0:*:*:*:*:alpine_linux:*:3.11

External links

https://git.alpinelinux.org/aports/commit/?id=876cd0b00070b30352575afe4aff651cdeb5eea6

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.