CVE-2021-30855
iPhone Link Validation Vulnerability
Description
A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.
INFO
Published Date :
Aug. 24, 2021, 7:15 p.m.
Last Modified :
Nov. 7, 2023, 3:33 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
Public PoC/Exploit Available at Github
CVE-2021-30855 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-30855
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-30855.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Here is some resources about macOS/iOS system security.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-30855 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-30855 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference Apple Inc. https://support.apple.com/en-us/HT212804 [No types assigned] Added Reference Apple Inc. https://support.apple.com/en-us/HT212805 [No types assigned] Added Reference Apple Inc. https://support.apple.com/en-us/HT212807 [No types assigned] Added Reference Apple Inc. https://support.apple.com/kb/HT212815 [No types assigned] Added Reference Apple Inc. https://support.apple.com/en-us/HT212814 [No types assigned] Added Reference Apple Inc. https://support.apple.com/en-us/HT212819 [No types assigned] Removed Reference MITRE https://support.apple.com/en-us/HT212814 Removed Reference MITRE https://support.apple.com/en-us/HT212807 Removed Reference MITRE https://support.apple.com/en-us/HT212804 Removed Reference MITRE https://support.apple.com/en-us/HT212805 Removed Reference MITRE https://support.apple.com/en-us/HT212819 Removed Reference MITRE https://support.apple.com/kb/HT212815 -
CVE Source Update by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed Source MITRE Apple Inc. -
CPE Deprecation Remap by [email protected]
Jan. 09, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions from (excluding) 14.8 OR *cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* versions from (excluding) 14.8 -
Modified Analysis by [email protected]
Feb. 11, 2022
Action Type Old Value New Value Changed Reference Type https://support.apple.com/kb/HT212815 No Types Assigned https://support.apple.com/kb/HT212815 Vendor Advisory Changed CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions up to (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0 up to (excluding) 11.6 *cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* versions up to (excluding) 15.0 *cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* versions up to (excluding) 8.0 OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions up to (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions up to (excluding) 11.6 *cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* versions up to (excluding) 15.0 *cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* versions up to (excluding) 8.0 -
CVE Modified by [email protected]
Jan. 20, 2022
Action Type Old Value New Value Added Reference https://support.apple.com/kb/HT212815 [No Types Assigned] -
Initial Analysis by [email protected]
Nov. 01, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Changed Reference Type https://support.apple.com/en-us/HT212804 No Types Assigned https://support.apple.com/en-us/HT212804 Vendor Advisory Changed Reference Type https://support.apple.com/en-us/HT212805 No Types Assigned https://support.apple.com/en-us/HT212805 Vendor Advisory Changed Reference Type https://support.apple.com/en-us/HT212807 No Types Assigned https://support.apple.com/en-us/HT212807 Vendor Advisory Changed Reference Type https://support.apple.com/en-us/HT212814 No Types Assigned https://support.apple.com/en-us/HT212814 Vendor Advisory Changed Reference Type https://support.apple.com/en-us/HT212819 No Types Assigned https://support.apple.com/en-us/HT212819 Vendor Advisory Added CWE NIST CWE-59 Added CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.8 *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions up to (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0 up to (excluding) 11.6 *cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* versions up to (excluding) 15.0 *cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* versions up to (excluding) 8.0 -
CVE Modified by [email protected]
Oct. 28, 2021
Action Type Old Value New Value Changed Description ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by the CVE program. Notes: none. A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files. Added Reference https://support.apple.com/en-us/HT212814 [No Types Assigned] Added Reference https://support.apple.com/en-us/HT212807 [No Types Assigned] Added Reference https://support.apple.com/en-us/HT212804 [No Types Assigned] Added Reference https://support.apple.com/en-us/HT212805 [No Types Assigned] Added Reference https://support.apple.com/en-us/HT212819 [No Types Assigned] -
CVE Unrejected by [email protected]
Oct. 28, 2021
Action Type Old Value New Value -
CVE Rejected by [email protected]
Aug. 24, 2021
Action Type Old Value New Value
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-30855 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-30855
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.08 }} 0.00%
score
0.35733
percentile