Vulnerability Name:

CVE-2018-20538 (CCN-154885)

Assigned:2018-11-18
Published:2018-11-18
Updated:2019-01-10
Summary: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 certain finishes tests.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
4.9 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
3.3 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
2.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
1.7 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-416
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2018-20538

Source: CCN
Type: Bugzilla – Bug 3392531
There is a heap-use-after-free at asm/preproc.c:5055(function:pp_getline) in nasm2.14rc16 that will cause dos attack.

Source: MISC
Type: Exploit, Issue Tracking, Third Party Advisory
https://bugzilla.nasm.us/show_bug.cgi?id=3392531

Source: XF
Type: UNKNOWN
nasm-cve201820538-dos(154885)

Source: CCN
Type: NASM Web site
NASM

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2018-20538

Vulnerable Configuration:Configuration 1:
  • cpe:/a:nasm:netwide_assembler:2.14.0:rc16:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:2018205380000000
    V
    		CVE-2018-20538 on Ubuntu 19.04 (disco) - low.
    2018-12-28
    oval:com.ubuntu.bionic:def:201820538000
    V
    		CVE-2018-20538 on Ubuntu 18.04 LTS (bionic) - low.
    2018-12-28
    oval:com.ubuntu.cosmic:def:2018205380000000
    V
    		CVE-2018-20538 on Ubuntu 18.10 (cosmic) - low.
    2018-12-28
    oval:com.ubuntu.cosmic:def:201820538000
    V
    		CVE-2018-20538 on Ubuntu 18.10 (cosmic) - low.
    2018-12-28
    oval:com.ubuntu.bionic:def:2018205380000000
    V
    		CVE-2018-20538 on Ubuntu 18.04 LTS (bionic) - low.
    2018-12-28
    oval:com.ubuntu.trusty:def:201820538000
    V
    		CVE-2018-20538 on Ubuntu 14.04 LTS (trusty) - low.
    2018-12-28
    oval:com.ubuntu.xenial:def:2018205380000000
    V
    		CVE-2018-20538 on Ubuntu 16.04 LTS (xenial) - low.
    2018-12-28
    oval:com.ubuntu.xenial:def:201820538000
    V
    		CVE-2018-20538 on Ubuntu 16.04 LTS (xenial) - low.
    2018-12-28
    BACK
    nasm netwide assembler 2.14.0 rc16