Title: MnSCU/PALS WebPALS Remote Command Execution Vulnerability
Severity: HIGH
Description:
MnSCU/PALS WebPALS provides internet access to various automated library systems.
It is possible for an attacker to disclose a requested file on a machine running WebPALS. This vulnerability could also allow an attacker to execute arbitrary code with root privileges. The specially crafted URL would be composed of the target file and the malicious code.
Successful exploitation of this vulnerability could enable a remote user to gain access to systems files, password files, etc. This vulnerability could also lead to complete comprimise of the host.
This vulnerability involves the use of a "NULL" or "zero" value byte in the filename, an attack common to CGI vulnerabilities. Most C functions that deal with strings regard NULL bytes as string terminators, signifying the end of a string. High-level scripting languages, such as those often used for CGI applications, may not. When passing these filenames to underlying system functions that are written in C, they will often pass a null byte if supplied by a user through. This can cause the string, when intrepreted by the lower level C function, to be cut off prematurely. In situations where files are opened or commands are executed involving user-supplied data, this may pose a security threat.
Affected Products:
- MnSCU/PALS WebPALS 1.0.0
References:
- MnSCU/PALS: WebPALS Homepage
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