LibSass up to 3.5.5 Parser parser.cpp parse_css_variable_value Variable resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in LibSass up to 3.5.5. Affected by this issue is the function Sass::Parser::parse_css_variable_value of the file parser.cpp of the component Parser. This manipulation as part of Variable causes resource consumption. This vulnerability is handled as CVE-2018-20821. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in LibSass up to 3.5.5 (Programming Language Software). It has been declared as problematic. Affected by this vulnerability is the function Sass::Parser::parse_css_variable_value of the file parser.cpp of the component Parser. The manipulation as part of a Variable leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp).

The weakness was released 04/23/2019 (Website). The advisory is shared at lists.opensuse.org. This vulnerability is known as CVE-2018-20821 since 04/23/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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

Entry connected to this vulnerability is available at VDB-133982. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
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: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
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

04/23/2019 🔍
04/23/2019 +0 days 🔍
04/23/2019 +0 days 🔍
09/06/2023 +1597 days 🔍

Sourcesinfo

Advisory: 2658
Status: Not defined

CVE: CVE-2018-20821 (🔍)
GCVE (CVE): GCVE-0-2018-20821
GCVE (VulDB): GCVE-100-133981
See also: 🔍

Entryinfo

Created: 04/23/2019 19:32
Updated: 09/06/2023 15:40
Changes: 04/23/2019 19:32 (57), 06/01/2020 15:15 (1), 09/06/2023 15:40 (3)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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