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Fix the security bug found by Orange Labs

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Verify the length of decrypt operation is a multiple of blocksize
This commit is contained in:
Aris Adamantiadis
2009-09-13 22:07:01 +02:00
parent 4b363928f6
commit f28352707a
1 changed files with 8 additions and 2 deletions
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10
libssh/crypt.c
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@@ -59,7 +59,10 @@ uint32_t packet_decrypt_len(SSH_SESSION *session, char *crypted){
int packet_decrypt(SSH_SESSION *session, void *data,uint32_t len) {
struct crypto_struct *crypto = session->current_crypto->in_cipher;
char *out = NULL;
if(len % session->current_crypto->in_cipher->blocksize != 0){
ssh_set_error(session, SSH_FATAL, "Cryptographic functions must be set on at least one blocksize (received %d)",len);
return SSH_ERROR;
}
out = malloc(len);
if (out == NULL) {
return -1;
@@ -99,7 +102,10 @@ unsigned char *packet_encrypt(SSH_SESSION *session, void *data, uint32_t len) {
if (!session->current_crypto) {
return NULL; /* nothing to do here */
}
if(len % session->current_crypto->in_cipher->blocksize != 0){
ssh_set_error(session, SSH_FATAL, "Cryptographic functions must be set on at least one blocksize (received %d)",len);
return NULL;
}
out = malloc(len);
if (out == NULL) {
return NULL;