Netwide Assembler 2.14rc16 asm/preproc.c pp_getline use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Netwide Assembler 2.14rc16. Affected by this vulnerability is the function pp_getline of the file asm/preproc.c. The manipulation results in use after free. This vulnerability is reported as CVE-2018-20535. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Netwide Assembler 2.14rc16 (Programming Tool Software). Affected is the function pp_getline of the file asm/preproc.c. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 11/18/2018. The weakness was disclosed 12/28/2018 (Website). The advisory is available at bugzilla.nasm.us. This vulnerability is traded as CVE-2018-20535 since 12/27/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 40 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/18/2018 🔍
12/27/2018 +39 days 🔍
12/28/2018 +1 days 🔍
12/28/2018 +0 days 🔍
12/29/2018 +1 days 🔍
04/24/2020 +482 days 🔍

Sourcesinfo

Advisory: bugzilla.nasm.us
Status: Not defined

CVE: CVE-2018-20535 (🔍)
GCVE (CVE): GCVE-0-2018-20535
GCVE (VulDB): GCVE-100-128502
See also: 🔍

Entryinfo

Created: 12/29/2018 17:27
Updated: 04/24/2020 21:07
Changes: 12/29/2018 17:27 (59), 04/24/2020 21:07 (1)
Complete: 🔍
Cache ID: 216::103

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