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34 lines
1.1 KiB
34 lines
1.1 KiB
8 months ago
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From c232bc1f346a6af9777c216d01f7940898ae1650 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 19 Oct 2018 12:12:33 +0200
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Subject: [PATCH] dhcp6: make sure we have enough space for the DHCP6 option
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header
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Fixes a vulnerability originally discovered by Felix Wilhelm from
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Google.
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CVE-2018-15688
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LP: #1795921
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https://bugzilla.redhat.com/show_bug.cgi?id=1639067
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(cherry-picked from commit 4dac5eaba4e419b29c97da38a8b1f82336c2c892)
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Resolves: #1643363
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---
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src/libsystemd-network/dhcp6-option.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/libsystemd-network/dhcp6-option.c b/src/libsystemd-network/dhcp6-option.c
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index 18196b1257..0979497299 100644
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--- a/src/libsystemd-network/dhcp6-option.c
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+++ b/src/libsystemd-network/dhcp6-option.c
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@@ -103,7 +103,7 @@ int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, DHCP6IA *ia) {
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return -EINVAL;
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}
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- if (*buflen < len)
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+ if (*buflen < offsetof(DHCP6Option, data) + len)
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return -ENOBUFS;
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ia_hdr = *buf;
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