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Vulnerability Details :

CVE-2021-27241

Summary
Assigner-zdi
Assigner Org ID-99f1926a-a320-47d8-bbb5-42feb611262e
Published At-29 Mar, 2021 | 21:05
Updated At-03 Aug, 2024 | 20:48
Rejected At-
Credits

This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:zdi
Assigner Org ID:99f1926a-a320-47d8-bbb5-42feb611262e
Published At:29 Mar, 2021 | 21:05
Updated At:03 Aug, 2024 | 20:48
Rejected At:
▼CVE Numbering Authority (CNA)

This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.

Affected Products
Vendor
Avast
Product
Premium Security
Versions
Affected
  • 20.8.2429 (Build 20.8.5653.561)
Problem Types
TypeCWE IDDescription
CWECWE-59CWE-59: Improper Link Resolution Before File Access ('Link Following')
Type: CWE
CWE ID: CWE-59
Description: CWE-59: Improper Link Resolution Before File Access ('Link Following')
Metrics
VersionBase scoreBase severityVector
3.06.1MEDIUM
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Version: 3.0
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Abdelhamid Naceri
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.zerodayinitiative.com/advisories/ZDI-21-208/
x_refsource_MISC
Hyperlink: https://www.zerodayinitiative.com/advisories/ZDI-21-208/
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.zerodayinitiative.com/advisories/ZDI-21-208/
x_refsource_MISC
x_transferred
Hyperlink: https://www.zerodayinitiative.com/advisories/ZDI-21-208/
Resource:
x_refsource_MISC
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:zdi-disclosures@trendmicro.com
Published At:29 Mar, 2021 | 21:15
Updated At:01 Apr, 2021 | 16:04

This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.16.1MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Secondary3.06.1MEDIUM
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Primary2.03.6LOW
AV:L/AC:L/Au:N/C:N/I:P/A:P
Type: Primary
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Type: Secondary
Version: 3.0
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Type: Primary
Version: 2.0
Base score: 3.6
Base severity: LOW
Vector:
AV:L/AC:L/Au:N/C:N/I:P/A:P
CPE Matches

avast
avast
>>premium_security>>20.8.2429
cpe:2.3:a:avast:premium_security:20.8.2429:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-59Primaryzdi-disclosures@trendmicro.com
CWE ID: CWE-59
Type: Primary
Source: zdi-disclosures@trendmicro.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://www.zerodayinitiative.com/advisories/ZDI-21-208/zdi-disclosures@trendmicro.com
Third Party Advisory
VDB Entry
Hyperlink: https://www.zerodayinitiative.com/advisories/ZDI-21-208/
Source: zdi-disclosures@trendmicro.com
Resource:
Third Party Advisory
VDB Entry

Change History

0
Information is not available yet

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CWE ID-CWE-59
Improper Link Resolution Before File Access ('Link Following')
CVE-2021-1091
Matching Score-4
Assigner-NVIDIA Corporation
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Matching Score-4
Assigner-NVIDIA Corporation
CVSS Score-7.1||HIGH
EPSS-0.11% / 30.79%
||
7 Day CHG~0.00%
Published-22 Jul, 2021 | 04:25
Updated-03 Aug, 2024 | 15:55
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

NVIDIA GPU Display driver for Windows contains a vulnerability where an unprivileged user can create a file hard link that causes the driver to overwrite a file that requires elevated privilege to modify, which could lead to data loss or denial of service.

Action-Not Available
Vendor-NVIDIA Corporation
Product-gpu_display_driverNVIDIA GPU Display Driver
CWE ID-CWE-59
Improper Link Resolution Before File Access ('Link Following')
CVE-2020-3830
Matching Score-4
Assigner-Apple Inc.
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Matching Score-4
Assigner-Apple Inc.
CVSS Score-3.3||LOW
EPSS-0.18% / 40.01%
||
7 Day CHG~0.00%
Published-27 Feb, 2020 | 20:45
Updated-04 Aug, 2024 | 07:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in macOS Catalina 10.15.3. A malicious application may be able to overwrite arbitrary files.

Action-Not Available
Vendor-Apple Inc.
Product-mac_os_xmacOS
CWE ID-CWE-59
Improper Link Resolution Before File Access ('Link Following')
CVE-2016-9595
Matching Score-4
Assigner-Red Hat, Inc.
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Matching Score-4
Assigner-Red Hat, Inc.
CVSS Score-7.3||HIGH
EPSS-0.04% / 11.73%
||
7 Day CHG~0.00%
Published-27 Jul, 2018 | 18:00
Updated-06 Aug, 2024 | 02:59
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

A flaw was found in katello-debug before 3.4.0 where certain scripts and log files used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

Action-Not Available
Vendor-Red Hat, Inc.The Foreman
Product-satellitekatellosatellite_capsulekatello-debug
CWE ID-CWE-377
Insecure Temporary File
CWE ID-CWE-59
Improper Link Resolution Before File Access ('Link Following')
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