#VU36260 Use-after-free in Netwide Assembler - CVE-2018-20535

Vulnerability identifier: #VU36260

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-2018-20535

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Netwide Assembler
Universal components / Libraries / Scripting languages

Vendor: Netwide Assembler

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during a line-number increment attempt.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Netwide Assembler: 2.14.0

---

External links
https://bugzilla.nasm.us/show_bug.cgi?id=3392530

---

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.