RTKLIB Out-of-Bounds Read in RINEX Processing

Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

This vulnerability exists in RTKLIB through version 2.4.3 and involves an out-of-bounds read in the getcodepri function. It occurs when the software processes unrecognized RINEX observation codes. Attackers can exploit this by crafting RINEX files containing unknown observation types, which causes negative array indexing into the codepris table. This leads to reliable crashes and may also result in the disclosure of adjacent global memory data.

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Impact Analysis

The vulnerability can be exploited to cause a denial of service by crashing the affected application. Additionally, it may lead to the unintended disclosure of adjacent global memory data, which could potentially expose sensitive information.

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Detection Guidance

This vulnerability can be detected by monitoring for crashes or denial of service events in RTKLIB tools that process RINEX observation files, such as rnx2rtkp and RTKPOST.

Specifically, crafted RINEX files with unknown observation codes trigger the vulnerability, so testing with such files can help detect the issue.

There are no explicit detection commands provided, but you can attempt to process RINEX files containing unrecognized observation codes using RTKLIB tools and observe if crashes or abnormal behavior occur.

Additionally, monitoring system logs for crashes or denial of service symptoms related to RTKLIB processes can help identify exploitation attempts.

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Mitigation Strategies

Immediate mitigation involves avoiding the processing of untrusted or crafted RINEX observation files that may contain unknown observation codes.

If possible, update RTKLIB to a version that includes the fix which validates the observation code index before accessing the priority table.

As a temporary measure, restrict access to RTKLIB tools like rnx2rtkp and RTKPOST to trusted users and environments to reduce the risk of exploitation.

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