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Description: [CVE-2012-4527] Stack-based buffer overflow with long file names
.
A buffer overflow in mcrypt version 2.6.8 and earlier due to long filenames.
If a user were tricked into attempting to encrypt/decrypt specially crafted
long filename(s), this flaw would cause a stack-based buffer overflow that
could potentially lead to arbitrary code execution.
.
Note that this is caught by FORTIFY_SOURCE, which makes this a crash-only
bug on wheezy.
Author: Attila Bogar, Jean-Michel Vourgère <jmv_deb@nirgal.com>
Origin: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4527
Bug: CVE-2012-4527
Bug-Debian: http://bugs.debian.org/690924
Forwarded: no
Last-Update: 2012-11-01
Index: mcrypt-2.6.8/src/mcrypt.c
===================================================================
--- mcrypt-2.6.8.orig/src/mcrypt.c
+++ mcrypt-2.6.8/src/mcrypt.c
@@ -41,4 +41,6 @@
+/* Temporary error message can contain one file name and 1k of text */
+#define ERRWIDTH ((PATH_MAX)+1024)
-char tmperr[128];
+char tmperr[ERRWIDTH];
unsigned int stream_flag = FALSE;
char *keymode = NULL;
char *mode = NULL;
@@ -482,7 +485,7 @@
#ifdef HAVE_STAT
if (stream_flag == FALSE) {
if (is_normal_file(file[i]) == FALSE) {
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("%s: %s is not a regular file. Skipping...\n"),
program_name, file[i]);
@@ -501,7 +504,7 @@
dinfile = file[i];
if ((isatty(fileno((FILE *) (stdin))) == 1)
&& (stream_flag == TRUE) && (force == 0)) { /* not a tty */
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("%s: Encrypted data will not be read from a terminal.\n"),
program_name);
@@ -520,7 +523,7 @@
einfile = file[i];
if ((isatty(fileno((FILE *) (stdout))) == 1)
&& (stream_flag == TRUE) && (force == 0)) { /* not a tty */
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("%s: Encrypted data will not be written to a terminal.\n"),
program_name);
@@ -544,7 +547,7 @@
strcpy(outfile, einfile);
/* if file has already the .nc ignore it */
if (strstr(outfile, ".nc") != NULL) {
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("%s: file %s has the .nc suffix... skipping...\n"),
program_name, outfile);
@@ -590,10 +593,10 @@
if (x == 0) {
if (stream_flag == FALSE) {
- sprintf(tmperr, _("File %s was decrypted.\n"), dinfile);
+ snprintf(tmperr, ERRWIDTH, _("File %s was decrypted.\n"), dinfile);
err_warn(tmperr);
} else {
- sprintf(tmperr, _("Stdin was decrypted.\n"));
+ snprintf(tmperr, ERRWIDTH, _("Stdin was decrypted.\n"));
err_warn(tmperr);
}
#ifdef HAVE_STAT
@@ -610,7 +613,7 @@
} else {
if (stream_flag == FALSE) {
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("File %s was NOT decrypted successfully.\n"),
dinfile);
@@ -636,10 +639,10 @@
if (x == 0) {
if (stream_flag == FALSE) {
- sprintf(tmperr, _("File %s was encrypted.\n"), einfile);
+ snprintf(tmperr, ERRWIDTH, _("File %s was encrypted.\n"), einfile);
err_warn(tmperr);
} else {
- sprintf(tmperr, _("Stdin was encrypted.\n"));
+ snprintf(tmperr, ERRWIDTH, _("Stdin was encrypted.\n"));
err_warn(tmperr);
}
#ifdef HAVE_STAT
@@ -655,7 +658,7 @@
} else {
if (stream_flag == FALSE) {
- sprintf(tmperr,
+ snprintf(tmperr, ERRWIDTH,
_
("File %s was NOT encrypted successfully.\n"),
einfile);
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