Amazon Linux AMI update for yasm

Published: 2023-04-07

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-33454 CVE-2021-33459
CWE-ID	CWE-476
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system yasm Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU74583

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 - NULL Pointer Dereference

Exploit availability: No

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

Update the affected packages:

i686:
    yasm-devel-1.2.0-1.5.amzn1.i686
    yasm-1.2.0-1.5.amzn1.i686
    yasm-debuginfo-1.2.0-1.5.amzn1.i686

src:
    yasm-1.2.0-1.5.amzn1.src

x86_64:
    yasm-devel-1.2.0-1.5.amzn1.x86_64
    yasm-1.2.0-1.5.amzn1.x86_64
    yasm-debuginfo-1.2.0-1.5.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

yasm: All versions

CPE2.3

External links

https://alas.aws.amazon.com/ALAS-2023-1724.html

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.

2) NULL pointer dereference

EUVDB-ID: #VU74584