Weakness (CWE)
CWE-1265: Unintended Reentrant Invocation of Non-reentrant Code Via Nested Calls
The product invokes code that is believed to be reentrant, but the code performs a call that unintentionally produces a nested invocation of non-reentrant code.
More detail
In a complex product, a single function call may lead to many different possible code paths, some of which may involve deeply nested calls. It may be difficult to foresee all possible code paths that could emanate from a given function call, even if that call is assumed to be reentrant. In some systems, an external actor can manipulate inputs to the system and thereby achieve a wide range of possible control flows. This is frequently a concern in products that execute scripts from untrusted sources. Examples of such products are web browsers and PDF readers. A weakness is present when one of the possible code paths resulting from a function call alters program state that the original caller assumes to be unchanged during the call.
How to prevent it (2 mitigations)
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Architecture and Design
When architecting a system that will execute untrusted code in response to events, consider executing the untrusted event handlers asynchronously (asynchronous message passing) as opposed to executing them synchronously at the time each event fires. The untrusted code should execute at the start of the next iteration of the thread's message loop. In this way, calls into non-reentrant code are strictly serialized, so that each operation completes fully before the next operation begins. Special attention must be paid to all places where type coercion may result in script execution. Performing all needed coercions at the very beginning of an operation can help reduce the chance of operations executing at unexpected junctures.
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Implementation
Make sure the code (e.g., function or class) in question is reentrant by not leveraging non-local data, not modifying its own code, and not calling other non-reentrant code.
Source: MITRE CWE-1265
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High 7.7
Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git service
A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invali…
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High 8.8
SameSite Attribute vulnerability in pimCore
An improper SameSite Attribute vulnerability in pimCore v10.5.15 allows attackers to execute arbitrary code.