Out-of-Bounds Write in wolfSSL

Detection Guidance

This vulnerability involves an out-of-bounds write in the wolfSSL library's SetSuitesHashSigAlgo function when processing an oversized signature algorithms list. Detection would involve identifying if your system is using a vulnerable version of wolfSSL that lacks the fix.

To detect if the vulnerable code is present, you can check the wolfSSL version or inspect the source code for the presence of the bounds check added in pull request #10204.

For testing the fix, the wolfSSL project uses the commands: `./configure --enable-opensslextra` followed by `make && make check`. Running these commands on your build environment can help verify if the fix is applied.

There are no specific network detection commands or signatures provided in the available information.

Useful 0 Not Useful 0

Executive Summary

This vulnerability is an out-of-bounds write issue occurring in the SetSuitesHashSigAlgo function. It happens when processing an oversized list of signature algorithms, which allows writing data beyond the allocated bounds of the destination buffer.

Useful 0 Not Useful 0

Impact Analysis

The vulnerability allows writing past the bounds of a buffer, which can lead to memory corruption. This might cause unexpected behavior such as crashes, data corruption, or potentially enable an attacker to execute arbitrary code or escalate privileges depending on the context in which the vulnerable function is used.

Useful 0 Not Useful 0

Mitigation Strategies

The immediate mitigation step is to update wolfSSL to a version that includes the fix from pull request #10204, which adds a preflight bounds check to prevent the buffer overflow.

If updating is not immediately possible, consider disabling or restricting the use of TLS 1.3 RSA-PSS signature algorithms in your configuration, as the vulnerability is triggered by processing oversized signature algorithm lists involving RSA-PSS.

Verify your build and deployment processes include the fix by running `./configure --enable-opensslextra` and `make && make check` to ensure the vulnerability is addressed.

Useful 0 Not Useful 0