#VU23825 Untrusted pointer dereference in UPX - CVE-2019-20053

Vulnerability identifier: #VU23825

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-20053

CWE-ID: CWE-822

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
UPX
Universal components / Libraries / Libraries used by multiple products

Vendor: UPX

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to invalid memory address dereference within the canUnpack() function in p_mach.cpp. A remote attacker can pass a specially crafted Mach-O file to the application and perform a denial of service attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

UPX: 3.95

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External links
https://github.com/upx/upx/issues/314

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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.