CVE-2020-14147 : Vulnerability Insights and Analysis

An integer overflow vulnerability in Redis before version 6.0.3 could allow attackers running Lua code in a Redis session to cause a denial of service or bypass sandbox restrictions.

Understanding CVE-2020-14147

This CVE involves an integer overflow issue in Redis that could lead to memory corruption and application crashes.

What is CVE-2020-14147?

The vulnerability stems from an integer overflow in the getnum function in lua_struct.c in Redis before version 6.0.3. Attackers with permission to execute Lua code in a Redis session can exploit this flaw to trigger a stack-based buffer overflow, potentially resulting in a denial of service or bypassing sandbox restrictions.

The Impact of CVE-2020-14147

The vulnerability could allow context-dependent attackers to disrupt Redis service, leading to memory corruption, application crashes, and potential bypassing of security sandbox restrictions.

Technical Details of CVE-2020-14147

This section provides more technical insights into the vulnerability.

Vulnerability Description

The integer overflow in the getnum function in lua_struct.c in Redis before 6.0.3 allows attackers to trigger a stack-based buffer overflow, leading to memory corruption and potential application crashes.

Affected Systems and Versions

Affected Version: Redis before 6.0.3
Systems: Redis instances where attackers have permission to run Lua code

Exploitation Mechanism

Attackers can exploit this vulnerability by providing a large number as input to the getnum function, triggering the stack-based buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2020-14147 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Redis to version 6.0.3 or later to mitigate the vulnerability
Monitor Redis sessions for any suspicious Lua code execution

Long-Term Security Practices

Implement strict Lua code execution permissions in Redis
Regularly audit and update Redis to the latest versions

Patching and Updates

Apply patches provided by Redis to address the integer overflow vulnerability