CAPEC Definitions / CAPEC-67
CAPEC-67: String Format Overflow in syslog()
This attack targets applications and software that uses the syslog() function insecurely. If an application does not explicitely use a format string parameter in a call to syslog(), user input can be placed in the format string parameter leading to a format string injection attack. Adversaries can then inject malicious format string commands into the function call leading to a buffer overflow. There are many reported software vulnerabilities with the root cause being a misuse of the syslog() function.
Extended Description
No Extended Description.
Mitigations
The code should be reviewed for misuse of the Syslog function call. Manual or automated code review can be used. The reviewer needs to ensure that all format string functions are passed a static string which cannot be controlled by the user and that the proper number of arguments are always sent to that function as well. If at all possible, do not use the %n operator in format strings. The following code shows a correct usage of Syslog(): syslog(LOG_ERR, %s, cmdBuf); The following code shows a vulnerable usage of Syslog(): syslog(LOG_ERR, cmdBuf); // the buffer cmdBuff is taking user supplied data.
Relationships with other CAPECs
Prerequisites
The Syslog function is used without specifying a format string argument, allowing user input to be placed direct into the function call as a format string.
Related Weaknesses
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-134: Use of Externally-Controlled Format String
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-20: Improper Input Validation
CWE-680: Integer Overflow to Buffer Overflow
CWE-697: Incorrect Comparison
