ZDI-CAN-17578: ZDI-23-1472: (0Day) Exim libspf2 Integer Underflow Remote Code Execution Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account.
Other sources
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.5. The following CVEs are assigned: CVE-2023-42118.
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-CAN-17578?
The severity of ZDI-CAN-17578 is high due to the potential for network-adjacent attackers to execute arbitrary code without authentication.
How do I fix ZDI-CAN-17578?
To fix ZDI-CAN-17578, update Exim libspf2 to the latest version that addresses this vulnerability.
What are the potential impacts of ZDI-CAN-17578?
The potential impacts of ZDI-CAN-17578 include unauthorized code execution which can compromise the affected system.
Who is affected by ZDI-CAN-17578?
ZDI-CAN-17578 affects installations of Exim libspf2 that process SPF macros.
Is authentication required to exploit ZDI-CAN-17578?
No, authentication is not required to exploit ZDI-CAN-17578, making it particularly concerning.