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From 13f135c7a252cc46cff96e75968d92b6dc8dce1b Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Fri, 8 Jun 2018 10:45:21 +0200
Subject: [PATCH] gpg: Sanitize diagnostic with the original file name.
* g10/mainproc.c (proc_plaintext): Sanitize verbose output.
--
This fixes a forgotten sanitation of user supplied data in a verbose
mode diagnostic. The mention CVE is about using this to inject
status-fd lines into the stderr output. Other harm good as well be
done. Note that GPGME based applications are not affected because
GPGME does not fold status output into stderr.
CVE-id: CVE-2018-12020
GnuPG-bug-id: 4012
---
g10/mainproc.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/g10/mainproc.c b/g10/mainproc.c
index d2ceec2fd..a9da08f74 100644
--- a/g10/mainproc.c
+++ b/g10/mainproc.c
@@ -851,7 +851,14 @@ proc_plaintext( CTX c, PACKET *pkt )
if (pt->namelen == 8 && !memcmp( pt->name, "_CONSOLE", 8))
log_info (_("Note: sender requested \"for-your-eyes-only\"\n"));
else if (opt.verbose)
- log_info (_("original file name='%.*s'\n"), pt->namelen, pt->name);
+ {
+ /* We don't use print_utf8_buffer because that would require a
+ * string change which we don't want in 2.2. It is also not
+ * clear whether the filename is always utf-8 encoded. */
+ char *tmp = make_printable_string (pt->name, pt->namelen, 0);
+ log_info (_("original file name='%.*s'\n"), (int)strlen (tmp), tmp);
+ xfree (tmp);
+ }
free_md_filter_context (&c->mfx);
if (gcry_md_open (&c->mfx.md, 0, 0))
--
2.17.1
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