Ubuntu Security Notice 6889-1 - It was discovered that .NET did not properly handle object deserialization. An attacker could possibly use this issue to cause a denial of service. Radek Zikmund discovered that .NET did not properly manage memory. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. It was discovered that .NET did not properly parse X.509 Content and ObjectIdentifiers. An attacker could possibly use this issue to cause a denial of service.
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