36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/c7ede54cbd2e2b25385325600958ba0124e31cc0
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https://bugzilla.redhat.com/show_bug.cgi?id=1835986
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https://bugs.gentoo.org/731992
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From c7ede54cbd2e2b25385325600958ba0124e31cc0 Mon Sep 17 00:00:00 2001
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From: Ralf Haferkamp <rhafer@suse.com>
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Date: Fri, 3 Jul 2020 14:51:16 +0200
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Subject: [PATCH] Drop bogus IPv6 messages
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Drop IPv6 message shorter than what's mentioned in the payload
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length header (+ the size of the IPv6 header). They're invalid an could
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lead to data leakage in icmp6_send_echoreply().
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---
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src/ip6_input.c | 7 +++++++
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1 file changed, 7 insertions(+)
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--- a/slirp/src/ip6_input.c
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+++ b/slirp/src/ip6_input.c
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@@ -49,6 +49,13 @@ void ip6_input(struct mbuf *m)
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goto bad;
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}
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+ // Check if the message size is big enough to hold what's
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+ // set in the payload length header. If not this is an invalid
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+ // packet
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+ if (m->m_len < ntohs(ip6->ip_pl) + sizeof(struct ip6)) {
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+ goto bad;
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+ }
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+
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/* check ip_ttl for a correct ICMP reply */
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if (ip6->ip_hl == 0) {
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icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
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--
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GitLab
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