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openSUSE:Leap:15.4:Update
qemu-testsuite.20395
0237-Drop-bogus-IPv6-messages.patch
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File 0237-Drop-bogus-IPv6-messages.patch of Package qemu-testsuite.20395
From: Ralf Haferkamp <rhafer@suse.com> Date: Fri, 3 Jul 2020 14:51:16 +0200 Subject: Drop bogus IPv6 messages Git-commit: c7ede54cbd2e2b25385325600958ba0124e31cc0 References: bsc#1172380 CVE-2020-10756 Drop IPv6 message shorter than what's mentioned in the payload length header (+ the size of the IPv6 header). They're invalid an could lead to data leakage in icmp6_send_echoreply(). Signed-off-by: Jose R Ziviani <jose.ziviani@suse.com> --- slirp/ip6_input.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/slirp/ip6_input.c b/slirp/ip6_input.c index ac2e3ea882a7b184e3156855a647..deb3d6e086a87690a4ad98d86dcf 100644 --- a/slirp/ip6_input.c +++ b/slirp/ip6_input.c @@ -49,6 +49,13 @@ void ip6_input(struct mbuf *m) goto bad; } + // Check if the message size is big enough to hold what's + // set in the payload length header. If not this is an invalid + // packet + if (m->m_len < ntohs(ip6->ip_pl) + sizeof(struct ip6)) { + goto bad; + } + /* check ip_ttl for a correct ICMP reply */ if (ip6->ip_hl == 0) { icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
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