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