Attacker Value
Very High
0
CVE-2023-42115
0
CVE ID
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Attacker Value
Very High
(1 user assessed)
Exploitability
Moderate
(1 user assessed)User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
0
MITRE ATT&CK
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Common in enterpriseEasy to weaponizeGives privileged accessUnauthenticatedAuthenticatedNo useful accessRequires user interactionVulnerable in uncommon configuration
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Description
Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.
. Was ZDI-CAN-17434.
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1
Ratings
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Attacker ValueVery High
-
ExploitabilityMedium
Technical Analysis
Vulnerability Overview:
- CVE Identifier: CVE-2023-42115
- Affected Software: OpenSMTPD
- Affected Version: 4.96.2
- Vulnerability Type: Service-specific security vulnerability
- Vulnerability Impact: Potential remote code execution (RCE) or unauthorized access
- Disclosure Date: August 29, 2023
- Severity: High (potential for remote code execution)
Description:
- CVE-2023-42115 is a vulnerability found in OpenSMTPD version 4.96.2, a popular open-source mail transfer agent. The vulnerability arises from improper handling of certain service requests, which may lead to remote code execution or unauthorized access. The details about the exploitation method or conditions are not fully disclosed but involve potential flaws in handling email data or commands.
Technical Details
- Vulnerability Mechanism: The flaw relates to how the OpenSMTPD service processes incoming data or commands. - Exploitation: An attacker who can send specially crafted requests to the OpenSMTPD service may exploit this vulnerability to execute arbitrary code on the server running the affected version. - Impact: Successful exploitation can lead to full system compromise, allowing attackers to gain control over the mail server and potentially other systems within the network. - Exploitation Attempts: Security researchers and attackers may attempt to exploit this vulnerability by sending malformed or specially crafted email messages to the OpenSMTPD server.
Links
Exploit Code: https://bit.ly/cve_2023_42115
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Data provided by the National Vulnerability Database (NVD)
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
Unknown
Privileges Required (PR):
Unknown
User Interaction (UI):
Unknown
Scope (S):
Unknown
Confidentiality (C):
Unknown
Integrity (I):
Unknown
Availability (A):
Unknown
General Information
Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Exim exim 4.95
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown
Vendors
- Exim
Products
- Exim
References
Exploit
PoCs that have not been added by contributors directly have been sourced from:
nomi-sec/PoC-in-GitHub.
A PoC added here by the AKB Worker must have at least 2 GitHub stars.
A PoC added here by the AKB Worker must have at least 2 GitHub stars.
cve-2023-42115 (https://github.com/isotaka134/cve-2023-42115) (Added by AKB Worker)
Additional Info
Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Rapid7
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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