SB2018091314 - Multiple vulnerabilities in Netwide Assembler

Description

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2018-19755)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.9 [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]

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

There is an illegal address access at asm/preproc.c (function: is_mmacro) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service (out-of-bounds array access) because a certain conversion can result in a negative integer.

2) Input validation error (CVE-ID: CVE-2018-19213)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.9 [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]

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

Netwide Assembler (NASM) through 2.14rc16 has memory leaks that may lead to DoS, related to nasm_malloc in nasmlib/malloc.c.

3) Out-of-bounds write (CVE-ID: CVE-2018-16999)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.9 [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]

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

Netwide Assembler (NASM) 2.14rc15 has an invalid memory write (segmentation fault) in expand_smacro in preproc.c, which allows attackers to cause a denial of service via a crafted input file.

Remediation

Install update from vendor's website.

References

• https://bugzilla.nasm.us/show_bug.cgi?id=3392528
• https://repo.or.cz/nasm.git/commit/3079f7966dbed4497e36d5067cbfd896a90358cb
• https://bugzilla.nasm.us/show_bug.cgi?id=3392524
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00015.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00017.html
• https://bugzilla.nasm.us/show_bug.cgi?id=3392508