CVE-2023-6129

/// Technical description

Issue summary: The POLY1305 MAC (message authentication code) implementation

contains a bug that might corrupt the internal state of applications running

on PowerPC CPU based platforms if the CPU provides vector instructions.

Impact summary: If an attacker can influence whether the POLY1305 MAC

algorithm is used, the application state might be corrupted with various

application dependent consequences.

The POLY1305 MAC (message authentication code) implementation in OpenSSL for

PowerPC CPUs restores the contents of vector registers in a different order

than they are saved. Thus the contents of some of these vector registers

are corrupted when returning to the caller. The vulnerable code is used only

on newer PowerPC processors supporting the PowerISA 2.07 instructions.

The consequences of this kind of internal application state corruption can

be various - from no consequences, if the calling application does not

depend on the contents of non-volatile XMM registers at all, to the wors

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References