[PDF] [PDF] Race conditions

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RATS [3] for their ability to detect vulnerabilities in applications written the C More specifically, for the fopen() function, Flawfinder detected 64, while ITS4 

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Window of vulnerability can be very short open the file, using the file name (e g , using fopen(3)) – four levels of RATS (Rough Auditing Tool for Security)

[PDF] Race conditions

Software defect/vulnerability resulting from unanticipated execution ordering of Open with fopen() ○ Checks to Flawfinder and RATS – best public domain

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vulnerability types, combining our contracts with existing static analysis detection are com/security-resources/rats jsp Detect se if ((fp = fopen(fileName, ”r”)))

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external source to a vulnerable function without appropriate input validation I will present While ITS4 and Flawfinder target C and C++, RATS is also able to analyze Perl, PHP, and Python code FILE *file = fopen(path, "r"); 8 char c; 9

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izes in Windows security and vulnerability detection, as well as programs in Assembly, C memory"); 56 if((fp = fopen(argv[2], "rb"))) barf("failed to open file" );

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1Secure Coding in C and C++

Race conditions

Lecture 4

Acknowledgement: These slides are based on author Seacord's original presentationConcurrency and Race condition

Concurrency

Execution of Multiple flows (threads, processes, tasks, etc) If not controlled can lead to nondeterministic behavior

Race conditions

Software defect/vulnerability resulting from unanticipated execution ordering of concurrent flows E.g., two people simultaneously try to modify the same account (withrawing money) 2

Race condition

Necessary properties for a race condition

Concurrency property

At least two control flows executing concurrently

Shared object property

The concurrent flows must access a common shared

race object

Change state property

Atleast one control flow must alter the state of the race object

Race window

A code segment that accesses the race object in a

way that opens a window of opportunity for race condition

Sometimes referred to as critical section

Traditional approach

Ensure race windows do not overlap

Make them mutually exclusive

Language facilities -synchronization primitives (SP)

Deadlock is a risk related to SP

Denial of service

3

Time of Check, Time of Use

Source of race conditions

Trusted (tightly coupled threads of execution) or untrusted control flows (separate application or process)

ToCToU race conditions

Can occur during file I/O

Forms a RW by first checkingsome race object

and then usingit

Example

Assume the program is running with an

effective UID of root int main(int argc, char *argv[]) {

FILE *fd;

if (access("/some_file", W_OK) == 0) { printf("access granted.\n"); fd = fopen("/some_file", "wb+"); /* write to the file */ fclose(fd); } else { err(1, "ERROR"); return 0; } Figure 7-1 int main(int argc, char *argv[]) {

FILE *fd;

if (access("/some_file", W_OK) == 0) { printf("access granted.\n");quotesdbs_dbs7.pdfusesText_5