Heap-buffer-overflow in parse_relocation_info in radare2

Background

radare2 is an open-source framework for reverse engineering and analyzing binary files. It provides a set of tools and libraries to assist in tasks such as disassembling, debugging, and analyzing executable files. The vulnerability in question affects the parse_relocation_info function within radare2, which is responsible for parsing relocation information. This vulnerability can lead to a heap-buffer-overflow, potentially resulting in a crash or arbitrary code execution.

Vulnerability Detail

The vulnerability arises due to a heap-buffer-overflow in the parse_relocation_info function. This can be triggered by an attacker providing specially crafted relocation information, leading to a read of 4 bytes beyond the bounds of the allocated buffer. An attacker exploiting this vulnerability could potentially execute arbitrary code or cause a denial of service. The vulnerability was discovered through an OSS-Fuzz report and has been assigned a medium severity level.

Workaround

As a workaround, users can avoid the vulnerability by refraining from using the affected functionality or by implementing input validation to ensure that only valid relocation information is provided. Here is an example of how input validation can be implemented in C:

void parse_relocation_info(char* relocation_info) {
  if (validate_relocation_info(relocation_info)) {
    // Proceed with parsing
  } else {
    // Handle invalid input
  }
}

bool validate_relocation_info(char* relocation_info) {
  // Implement validation logic
}

Conclusion

In conclusion, the heap-buffer-overflow vulnerability in parse_relocation_info in radare2 can be mitigated by updating to a version that includes the fix. Users can also implement input validation as a temporary workaround. For further assistance with vulnerability remediation, please contact DevNack.com.

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