CVE-2019-16227 : Vulnerability Insights and Analysis

A problem was detected in version 0.97 of py-lmdb where specific mn_flags values trigger an invalid write operation in mdb_xcursor_init1 due to an unintended memcpy when using the mdb_cursor_set function. This vulnerability arises when accessing a data.mdb file provided by a malicious entity.

Understanding CVE-2019-16227

This CVE identifies a vulnerability in py-lmdb version 0.97 that can be exploited by an attacker to perform an illegal write operation.

What is CVE-2019-16227?

CVE-2019-16227 is a security flaw in py-lmdb 0.97 that allows for an invalid write operation when certain mn_flags values are used with the mdb_cursor_set function.

The Impact of CVE-2019-16227

The vulnerability can be exploited by an attacker to manipulate the mdb_cursor_set function, potentially leading to unauthorized write operations in the mdb_xcursor_init1 function.

Technical Details of CVE-2019-16227

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The issue in py-lmdb 0.97 arises from an unintended memcpy operation triggered by specific mn_flags values, leading to an invalid write operation in mdb_xcursor_init1.

Affected Systems and Versions

Affected Version: 0.97 of py-lmdb
Systems: Any system using py-lmdb 0.97

Exploitation Mechanism

The vulnerability can be exploited by providing a data.mdb file with malicious mn_flags values to trigger the invalid write operation.

Mitigation and Prevention

Protect your systems from CVE-2019-16227 with the following steps:

Immediate Steps to Take

Update py-lmdb to a patched version or apply vendor-supplied fixes.
Avoid opening data.mdb files from untrusted sources.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement secure coding practices to prevent buffer overflows and unintended memory operations.

Patching and Updates

Check for patches or updates provided by the py-lmdb vendor to address this vulnerability.