CVE-2021-38371
Exim STARTTLS Response Injection Vulnerability
Description
The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.
INFO
Published Date :
Aug. 10, 2021, 3:15 p.m.
Last Modified :
Nov. 21, 2024, 6:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source | 
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | 
Solution
- Update the Exim packages.
- If prompted, reboot the system.
Public PoC/Exploit Available at Github
                                            CVE-2021-38371 has a 3 public
                                            PoC/Exploit available at Github.
                                            Go to the Public Exploits tab to see the list.
                                        
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-2021-38371.
                                        
| URL | Resource | 
|---|---|
| https://nostarttls.secvuln.info | Tool Signature | 
| https://www.exim.org | Product | 
| https://www.exim.org/static/doc/security/CVE-2021-38371.txt | Broken Link Vendor Advisory | 
| https://nostarttls.secvuln.info | Tool Signature | 
| https://www.exim.org | Product | 
| https://www.exim.org/static/doc/security/CVE-2021-38371.txt | Broken Link Vendor Advisory | 
CWE - Common Weakness Enumeration
            While CVE identifies
            specific instances of vulnerabilities, CWE categorizes the common flaws or
            weaknesses that can lead to vulnerabilities. CVE-2021-38371 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-2021-38371
            weaknesses.
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).
A Chromium-based browser extension that adds ArchLinux as a search engine with an Omnibox keyword.
archlinux chrome-extension extension-chrome search-engine chromium-extension
JavaScript Ruby
Imoro Umar Farouq's report on Internal Network Penetration Testing
Shell
None
Dockerfile Makefile Go
Results are limited to the first 15 repositories due to potential performance issues.
			The following list is the news that have been mention
			CVE-2021-38371 vulnerability anywhere in the article.
		
                The following table lists the changes that have been made to the
                CVE-2021-38371 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 af854a3a-2127-422b-91ae-364da2661108Nov. 21, 2024 Action Type Old Value New Value Added Reference https://nostarttls.secvuln.info Added Reference https://www.exim.org Added Reference https://www.exim.org/static/doc/security/CVE-2021-38371.txt 
- 
                            CVE Modified by [email protected]May. 14, 2024 Action Type Old Value New Value 
- 
                            Initial Analysis by [email protected]Aug. 20, 2021 Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://nostarttls.secvuln.info No Types Assigned https://nostarttls.secvuln.info Tool Signature Changed Reference Type https://www.exim.org No Types Assigned https://www.exim.org Product Changed Reference Type https://www.exim.org/static/doc/security/CVE-2021-38371.txt No Types Assigned https://www.exim.org/static/doc/security/CVE-2021-38371.txt Broken Link, Vendor Advisory Added CWE NIST CWE-74 Added CPE Configuration OR *cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* versions up to (including) 4.94.2 
Vulnerability Scoring Details
Base CVSS Score: 7.5
Base CVSS Score: 5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.87 }} 0.67%
score
0.82492
percentile
 
                         
                         
                         
                                             
                                            