Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters

Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in MDC property keys and values, as well as the identity field that may carry attacker-influenced data. This causes an exception during serialization and the silent loss of the affected log event. An attacker who can influence any of these fields can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4net 3.3.0, which fixes this issue.

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对输出编码和转义不恰当

Apache log4net 安全漏洞

Apache log4net是美国阿帕奇（Apache）基金会的一款日志输出工具。 Apache Log4net 3.3.0之前版本存在安全漏洞，该漏洞源于XmlLayout和XmlLayoutSchemaLog4J未清理XML 1.0规范禁止的字符，可能导致日志记录丢失。

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