CVE-2017-16944 : Exploit Details and Defense Strategies
CVE-2017-16944 affects Exim versions 4.88 and 4.89, allowing remote attackers to trigger a denial of service attack. Learn about the impact, technical details, and mitigation steps.
Exim versions 4.88 and 4.89 are affected by a vulnerability that allows remote attackers to trigger a denial of service attack. The issue arises from vulnerabilities associated with BDAT commands and a faulty verification process of the '.' character in the receive_msg function.
Understanding CVE-2017-16944
This CVE entry details a vulnerability in the Exim SMTP daemon that can be exploited remotely to cause a denial of service attack.
What is CVE-2017-16944?
The receive_msg function in Exim versions 4.88 and 4.89 enables remote attackers to trigger a denial of service attack by exploiting vulnerabilities associated with BDAT commands and a faulty verification process of the '.' character.
The Impact of CVE-2017-16944
The vulnerability can lead to an infinite loop and stack exhaustion due to the bdat_getc function, resulting in a denial of service condition.
Technical Details of CVE-2017-16944
Examine the technical aspects of this CVE entry.
Vulnerability Description
The receive_msg function in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content.
Affected Systems and Versions
- Product: N/A
- Vendor: N/A
- Versions: 4.88 and 4.89
Exploitation Mechanism
The vulnerability can be exploited remotely by attackers to trigger a denial of service attack by manipulating BDAT commands and the verification process of the '.' character.
Mitigation and Prevention
Learn how to mitigate and prevent the CVE-2017-16944 vulnerability.
Immediate Steps to Take
- Apply vendor patches and updates promptly.
- Implement network security measures to restrict access to vulnerable systems.
Long-Term Security Practices
- Regularly update and patch all software and systems.
- Conduct security assessments and penetration testing to identify vulnerabilities.
Patching and Updates
- Refer to vendor advisories and security resources for patches and updates to address the CVE-2017-16944 vulnerability.