CVE-2009-2905 in newt
Summary
by MITRE
Heap-based buffer overflow in textbox.c in newt 0.51.5, 0.51.6, and 0.52.2 allows local users to cause a denial of service (application crash) or possibly execute arbitrary code via a request to display a crafted text dialog box.
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Analysis
by VulDB Data Team • 08/23/2021
The vulnerability identified as CVE-2009-2905 represents a critical heap-based buffer overflow within the newt library version 0.51.5, 0.51.6, and 0.52.2, specifically within the textbox.c component. This flaw resides in the text dialog box handling functionality of the newt library, which is a lightweight library for creating text mode user interfaces commonly used in system administration tools and installation programs. The vulnerability manifests when the library processes a crafted text dialog box request, creating an exploitable condition that can be leveraged by local attackers to compromise system integrity.
The technical implementation of this buffer overflow occurs due to insufficient bounds checking within the textbox.c module when handling user-supplied input strings. When a malicious user constructs a specially crafted text dialog box with excessive input data, the library fails to properly validate the length of the input before copying it into a fixed-size heap-allocated buffer. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially corrupting the heap structure and leading to unpredictable application behavior. The vulnerability is classified as heap-based because the overflow occurs in heap-allocated memory rather than stack memory, making it particularly challenging to exploit reliably.
From an operational perspective, this vulnerability presents a significant risk to systems utilizing the newt library for text-based user interfaces. Local users can leverage this flaw to either cause denial of service through application crashes or potentially execute arbitrary code with the privileges of the affected process. The impact extends beyond simple service disruption as the ability to execute arbitrary code represents a severe privilege escalation vector. Systems that rely on newt for installation processes, configuration tools, or system administration interfaces become particularly vulnerable, as attackers could exploit this weakness during normal system operations to gain unauthorized access or execute malicious payloads.
The exploitability of this vulnerability aligns with common attack patterns documented in the attack mitigation framework, where local privilege escalation and denial of service attacks represent primary threat vectors. This flaw maps to CWE-121, heap-based buffer overflow, and can be categorized under ATT&CK techniques related to privilege escalation and denial of service. Organizations using affected versions of newt should consider immediate remediation through patch updates, as the vulnerability affects multiple versions of the library and provides attackers with a straightforward path to system compromise. The remediation strategy should include comprehensive system auditing to identify all instances of the vulnerable library and implementation of proper input validation measures to prevent similar issues in future development cycles.
The broader implications of this vulnerability extend to software supply chain security, as many system administration tools and installation frameworks rely on newt for their text-based interfaces. This makes the vulnerability particularly dangerous in enterprise environments where multiple applications may be affected by a single underlying library flaw. Security teams should implement monitoring for suspicious process behavior and ensure that all system components are regularly updated to address known vulnerabilities. The vulnerability also highlights the importance of input validation in user interface libraries and demonstrates how seemingly benign functionality can become a critical security weakness when proper bounds checking is omitted.