CVE-2019-17042— Adiscon Rsyslog 缓冲区错误漏洞

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An issue was discovered in Rsyslog v8.1908.0. contrib/pmcisconames/pmcisconames.c has a heap overflow in the parser for Cisco log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon), but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.

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Adiscon Rsyslog 缓冲区错误漏洞

Adiscon Rsyslog是德国Adiscon公司的一个用于收集系统日志的库。 Adiscon Rsyslog v8.1908.0版本中的contrib/pmcisconames/pmcisconames.c文件存在缓冲区错误漏洞。远程攻击者可利用该漏洞在系统上执行任意代码或造成应用程序崩溃。

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