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23 Jan 2022
21 Jan 2022
How to fix?
PeterO.Cbor to version 4.5.1 or higher.
PeterO.Cbor is a C# implementation of Concise Binary Object Representation (CBOR).
Affected versions of this package are vulnerable to Denial of Service (DoS) via an inefficient algorithm when a maliciously crafted input is passed to
DecodeFromBytes or other CBOR decoding mechanisms.
An input that decodes to a single CBOR object is not capable of containing a CBOR map if:
- It begins with a byte other than
- It does not contain a byte in the range
0xBFSuch an input is not affected by this vulnerability and an application can choose to perform this check before passing it to a CBOR decoding mechanism.
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm