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From f8ad7c331b25ba90fd296b37c443b4114cb196e2 Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Sun, 3 Apr 2022 12:16:45 +0000
Subject: [PATCH] nslookup: sanitize all printed strings with printable_string
Otherwise, terminal sequences can be injected, which enables various terminal injection
attacks from DNS results.
MJ: One chunk wasn't applicable on 1.31.1 version, because parsing of
SRV records was added only in newer 1.32.0 with:
commit 6b4960155e94076bf25518e4e268a7a5f849308e
Author: Jo-Philipp Wich <jo@mein.io>
Date: Thu Jun 27 17:27:29 2019 +0200
nslookup: implement support for SRV records
CVE: CVE-2022-28391
Upstream-Status: Pending
Signed-off-by: Ariadne Conill <ariadne@dereferenced.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
networking/nslookup.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/networking/nslookup.c b/networking/nslookup.c
index 24e09d4f0..89b9c8a13 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -404,7 +404,7 @@ static int parse_reply(const unsigned char *msg, size_t len)
//printf("Unable to uncompress domain: %s\n", strerror(errno));
return -1;
}
- printf(format, ns_rr_name(rr), dname);
+ printf(format, ns_rr_name(rr), printable_string(dname));
break;
case ns_t_mx:
@@ -419,7 +419,7 @@ static int parse_reply(const unsigned char *msg, size_t len)
//printf("Cannot uncompress MX domain: %s\n", strerror(errno));
return -1;
}
- printf("%s\tmail exchanger = %d %s\n", ns_rr_name(rr), n, dname);
+ printf("%s\tmail exchanger = %d %s\n", ns_rr_name(rr), n, printable_string(dname));
break;
case ns_t_txt:
@@ -431,7 +431,7 @@ static int parse_reply(const unsigned char *msg, size_t len)
if (n > 0) {
memset(dname, 0, sizeof(dname));
memcpy(dname, ns_rr_rdata(rr) + 1, n);
- printf("%s\ttext = \"%s\"\n", ns_rr_name(rr), dname);
+ printf("%s\ttext = \"%s\"\n", ns_rr_name(rr), printable_string(dname));
}
break;
@@ -461,7 +461,7 @@ static int parse_reply(const unsigned char *msg, size_t len)
return -1;
}
- printf("\tmail addr = %s\n", dname);
+ printf("\tmail addr = %s\n", printable_string(dname));
cp += n;
printf("\tserial = %lu\n", ns_get32(cp));
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