7.0
HIGH
CVE-2021-3864
Apache Core Dump Privilege Escalation
Description

A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants. The prerequisite is a SUID binary that sets real UID equal to effective UID, and real GID equal to effective GID. The descendant will then have a dumpable value set to 1. As a result, if the descendant process crashes and core_pattern is set to a relative value, its core dump is stored in the current directory with uid:gid permissions. An unprivileged local user with eligible root SUID binary could use this flaw to place core dumps into root-owned directories, potentially resulting in escalation of privileges.

INFO

Published Date :

Aug. 26, 2022, 4:15 p.m.

Last Modified :

Feb. 12, 2023, 11:42 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

1.0
Public PoC/Exploit Available at Github

CVE-2021-3864 has a 9 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-2021-3864 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.

ID Vendor Product Action
1 Linux linux_kernel
1 Redhat enterprise_linux
1 Debian debian_linux
: Total Affected Vendor : 3 | Products : 3
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-2021-3864.

URL Resource
https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking Patch Third Party Advisory
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/
https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit Mailing List Third Party Advisory

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).

Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 1 month, 1 week ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 6 months, 3 weeks ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
lucasrod16/exploitlens

A simple, lightweight vulnerability scanner that reports if CVEs are present in the CISA KEV database.

Makefile Go

Updated: 10 months ago
1 stars 0 fork 0 watcher
Born at : Nov. 12, 2023, 8:29 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
robertsirc/sle-bci-demo

None

HTML C# CSS JavaScript Dockerfile

Updated: 3 weeks, 6 days ago
1 stars 2 fork 2 watcher
Born at : Aug. 30, 2023, 8:51 p.m. This repo has been linked 62 different CVEs too.
Profile Photo
whoforget/CVE-POC

None

Updated: 1 year, 6 months ago
0 stars 2 fork 2 watcher
Born at : April 8, 2023, 6:19 a.m. This repo has been linked 923 different CVEs too.
Profile Photo
k0mi-tg/CVE-POC

None

Updated: 7 months, 3 weeks ago
20 stars 3 fork 3 watcher
Born at : Feb. 14, 2023, 6:10 p.m. This repo has been linked 921 different CVEs too.
Profile Photo
WhooAmii/POC_to_review

None

Updated: 7 months, 2 weeks ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
vincent-deng/veracode-container-security-finding-parser

Map Vulnerabilities into Different Layers of the Container Image

Python

Updated: 1 year, 8 months ago
1 stars 0 fork 0 watcher
Born at : Oct. 5, 2022, 12:07 p.m. This repo has been linked 1276 different CVEs too.
Profile Photo
walac/cve-2021-3864

Test for cve-2021-3864

Makefile C

Updated: 2 years, 1 month ago
0 stars 0 fork 0 watcher
Born at : March 31, 2022, 8:03 p.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3864 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-3864 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]

    Feb. 12, 2023

    Action Type Old Value New Value
    Removed Reference https://lore.kernel.org/all/[email protected]/ [Mailing List, Patch, Vendor Advisory]
    Removed Reference https://lore.kernel.org/all/[email protected]/ [Mailing List, Patch, Vendor Advisory]
    Removed Reference https://lore.kernel.org/lkml/[email protected]/ [Mailing List, Patch, Vendor Advisory]
    Added Reference https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ [No Types Assigned]
    Added Reference https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ [No Types Assigned]
    Added Reference https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Sep. 01, 2022

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://access.redhat.com/security/cve/CVE-2021-3864 No Types Assigned https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2015046 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://lore.kernel.org/all/[email protected]/ No Types Assigned https://lore.kernel.org/all/[email protected]/ Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://lore.kernel.org/all/[email protected]/ No Types Assigned https://lore.kernel.org/all/[email protected]/ Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://lore.kernel.org/lkml/[email protected]/ No Types Assigned https://lore.kernel.org/lkml/[email protected]/ Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://security-tracker.debian.org/tracker/CVE-2021-3864 No Types Assigned https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory
    Changed Reference Type https://www.openwall.com/lists/oss-security/2021/10/20/2 No Types Assigned https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit, Mailing List, Third Party Advisory
    Added CWE NIST NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3864 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-2021-3864 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.05635

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: