VDB-124017 · CVE-2018-16999 · GCVE-0-2018-16999

NASM 2.14rc15 preproc.c expand_smacro out-of-bounds write

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in NASM 2.14rc15. It has been classified as problematic. This vulnerability affects the function expand_smacro of the file preproc.c. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2018-16999. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability was found in NASM 2.14rc15 (Programming Tool Software). It has been classified as problematic. This affects the function expand_smacro of the file preproc.c. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

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.

The bug was discovered 08/22/2018. The weakness was disclosed 09/13/2018 (Website). The advisory is shared at bugzilla.nasm.us. This vulnerability is uniquely identified as CVE-2018-16999 since 09/13/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 22 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Programming Tool Software

Name

NASM

Version

2.14rc15

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/22/2018 🔍
09/13/2018 +21 days 🔍
09/13/2018 +0 days 🔍
09/13/2018 +0 days 🔍
09/14/2018 +1 days 🔍
03/23/2020 +556 days 🔍

Sourcesinfo

Advisory: bugzilla.nasm.us
Status: Not defined

CVE: CVE-2018-16999 (🔍)
GCVE (CVE): GCVE-0-2018-16999
GCVE (VulDB): GCVE-100-124017

Entryinfo

Created: 09/14/2018 07:15
Updated: 03/23/2020 16:10
Changes: 09/14/2018 07:15 (57), 03/23/2020 16:10 (1)
Complete: 🔍
Cache ID: 216::103