CVE-2001-0070 in 1st Up Mail Server
Summary
by MITRE
Buffer overflow in 1st Up Mail Server 4.1 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long MAIL FROM command.
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Analysis
by VulDB Data Team • 04/09/2019
The vulnerability identified as CVE-2001-0070 represents a critical buffer overflow flaw within the 1st Up Mail Server version 4.1, specifically affecting the handling of the MAIL FROM command in the Simple Mail Transfer Protocol. This issue arises from insufficient input validation mechanisms that fail to properly sanitize or limit the length of email address parameters submitted during the mail transaction initiation phase. The flaw exists in the server's SMTP implementation where the application does not adequately check the boundaries of buffer allocations when processing the MAIL FROM command, creating an exploitable condition that can be leveraged by remote attackers to manipulate memory structures.
The technical exploitation of this vulnerability occurs when an attacker sends a specially crafted MAIL FROM command containing an excessively long string of characters that exceeds the allocated buffer size within the mail server's memory space. When the server processes this malformed input without proper bounds checking, it overflows the designated memory buffer and potentially corrupts adjacent memory locations. This memory corruption can lead to unpredictable behavior including application crashes, system instability, and in more sophisticated exploitation scenarios, arbitrary code execution within the context of the mail server process. The vulnerability falls under the Common Weakness Enumeration category of CWE-121, which specifically addresses stack-based buffer overflow conditions that can result in arbitrary code execution.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable full system compromise when exploited successfully. Remote attackers can leverage this flaw to cause the mail server to crash repeatedly, rendering email services unavailable to legitimate users and creating significant disruption to business operations. More critically, the buffer overflow condition may allow attackers to inject and execute malicious code within the server environment, potentially providing them with unauthorized access to the system and enabling further exploitation activities. This vulnerability directly aligns with ATT&CK technique T1190, which covers the exploitation of vulnerabilities in software to gain access to systems, and T1499, which addresses the use of network denial of service attacks to disrupt services.
Mitigation strategies for CVE-2001-0070 should include immediate implementation of input validation controls that enforce strict limits on the length of MAIL FROM parameters and other SMTP command inputs. System administrators should apply the vendor-provided patches or upgrade to newer versions of the 1st Up Mail Server that contain proper buffer management and input sanitization mechanisms. Network-level protections such as SMTP filtering rules and intrusion detection systems can help detect and block malformed MAIL FROM commands before they reach the vulnerable server. Additionally, implementing proper memory protection mechanisms including stack canaries, address space layout randomization, and non-executable stack protections can significantly reduce the exploitability of such buffer overflow conditions. Organizations should also conduct regular security assessments of their mail server configurations and maintain up-to-date vulnerability scanning processes to identify and remediate similar issues across their email infrastructure.