Executive Summary

CVE-2018-25253 is a buffer overflow vulnerability in Termite version 3.4, specifically in the User interface language settings field. Local attackers can exploit this by inputting an excessively long string—such as a 2000-byte payload—into this field, which causes the application to crash or become unresponsive, resulting in a denial of service (DoS). This happens because the application does not properly validate or limit the length of the input, leading to an out-of-bounds write.

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Impact Analysis

The primary impact of this vulnerability is a denial of service condition. An attacker with local access can crash the Termite application by supplying a very long string in the User interface language settings field, causing the program to become unresponsive or terminate unexpectedly. This disrupts normal operation and availability of the software.

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the denial of service condition on Termite 3.4 by inputting an excessively long string into the User interface language settings field.

A proof-of-concept method involves running a Python script that generates a 2000-character payload (e.g., 2000 'A's) written to a file, then copying and pasting this payload into the User interface language field within Termite's settings. Applying this input causes the application to crash or become unresponsive, confirming the presence of the vulnerability.

The Python script example to generate the payload is as follows:

• python -c "print('A'*2000)" > boom.txt

After running this command, open the generated 'boom.txt' file, copy its contents, and paste it into the User interface language field in Termite 3.4 settings to test for the crash.

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of excessively long strings in the User interface language settings field of Termite 3.4.

Since the vulnerability requires local access to the application, restricting access to trusted users and environments can reduce risk.

Additionally, consider updating or patching Termite if a fixed version is available, or applying any vendor-recommended workarounds to prevent buffer overflow conditions.

If no patch is available, refrain from modifying the User interface language setting with untrusted or unusually long input.

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Compliance Impact

The provided information does not specify any direct impact of CVE-2018-25253 on compliance with common standards and regulations such as GDPR or HIPAA.

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