#VU74583 NULL pointer dereference in yasm - CVE-2021-33454

Vulnerability identifier: #VU74583

Vulnerability risk: Low

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

CVE-ID: CVE-2021-33454

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
yasm
Universal components / Libraries / Programming Languages & Components

Vendor: www.tortall.net

Description

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

The vulnerability exists due to a NULL pointer dereference error within the yasm_expr_get_intnum() function in libyasm/expr.c. A remote attacker can perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

yasm: 0.1.0 - 1.3.0

---

External links
https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d
https://github.com/yasm/yasm/issues/166

---

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.