A security flaw has been discovered in OpenCart up to 4.1.0.3. Affected by this issue is some unknown functionality of the component Single-Use Coupon Handler. Performing manipulation results in race condition. The attack may be initiated remotely. The attacks complexity is rated as high. The exploitation is known to be difficult. The exploit has been released to the public and may be exploited. The vendor was contacted early about this disclosure but did not respond in any way.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
A race condition occurs within concurrent environments, and it is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc. A race condition violates these properties, which are closely related:
A race condition exists when an “interfering code sequence” can still access the shared resource, violating exclusivity. The interfering code sequence could be “trusted” or “untrusted.” A trusted interfering code sequence occurs within the product; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable product.