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GHSA-5jfw-35xp-5m42
No affected components available
Impact
LoginPacket uses BinaryStream->getLInt() to read the lengths of JSON payloads it wants to decode. Unfortunately, BinaryStream->getLInt() returns a signed integer, meaning that a malicious client can craft a packet with a large uint32 value for payload buffer size (which would be interpreted as a negative signed int32), causing BinaryStream->get() to throw an exception.
In the context of PocketMine-MP, this leads to a server crash when the vulnerability is exploited.
Patches
e3fce7632b94e83fd6a518a87dcaf6a11681c4ac
Workarounds
This can be worked around by registering a custom LoginPacket implementation into PacketPool which overrides this code to patch it.
For more information
- Email us at team@pmmp.io
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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