From bd463a5564a2c0618317448c3f965d389534c3df Mon Sep 17 00:00:00 2001 From: Ariadne Conill Date: Mon, 19 Sep 2022 14:15:12 +0200 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. CVE: CVE-2022-28391 Signed-off-by: Ariadne Conill Tested-by: Radoslav Kolev Backport from ML: http://lists.busybox.net/pipermail/busybox/2022-July/089795.html Signed-off-by: Quentin Schulz --- networking/nslookup.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/networking/nslookup.c b/networking/nslookup.c index 6da97baf4..4bdcde1b8 100644 --- a/networking/nslookup.c +++ b/networking/nslookup.c @@ -407,7 +407,7 @@ static NOINLINE 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: @@ -422,7 +422,7 @@ static NOINLINE 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: @@ -434,7 +434,7 @@ static NOINLINE 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; @@ -454,7 +454,7 @@ static NOINLINE int parse_reply(const unsigned char *msg, size_t len) } printf("%s\tservice = %u %u %u %s\n", ns_rr_name(rr), - ns_get16(cp), ns_get16(cp + 2), ns_get16(cp + 4), dname); + ns_get16(cp), ns_get16(cp + 2), ns_get16(cp + 4), printable_string(dname)); break; case ns_t_soa: @@ -483,7 +483,7 @@ static NOINLINE 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)); -- 2.37.3