lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Tue, 18 Aug 2009 11:13:05 -0600
Subject: ntop <= 3.3.10 Basic Authentication Null Pointer Denial of Service

Title: ntop <= 3.3.10 Basic Authentication Null Pointer Denial of Service

Vendor: ntop

Vendor URL:

Vendor Response: None


A denial of service condition can be reached by specifying an invalid value for the Authorization 
HTTP header. When ntop recieves this, it attempts to base64 decode the value then split it based on
a colon. When no colon exists in the decoded string the username is left at its default NULL value. 
During the authentication process the length of the username is computed via strlen(), which results
in a segmentation fault when it processes the null value. 


static int checkHTTPpassword(char *theRequestedURL,
                             int theRequestedURLLen _UNUSED_,
                             char* thePw, int thePwLen) {
  char outBuffer[65], tmpOutBuffer[65], *user = NULL, users[LEN_GENERAL_WORK_BUFFER];

Powered by blists - more mailing lists