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Hugo SIMELIERE (Schneider Electric)
f1d78e9527
Pick patch from [1] dnsmasq 2.90 debian bookworm pacthes. [1] https://sources.debian.org/src/dnsmasq/2.90-4~deb12u2/debian/patches/CVE-2026-5172.patch Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com> Reviewed-by: Bruno VERNAY <bruno.vernay@se.com> Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
40 lines
1.5 KiB
Diff
40 lines
1.5 KiB
Diff
From f158664062e049ec4604f6e772551a00575011f4 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Mon, 30 Mar 2026 16:24:33 +0100
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Subject: [PATCH] Fix buffer overflow vulnerability in extract_addresses()
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CVE-2026-5172
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Thanks to Hugo Martinez Ray for spotting this.
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The value of rdlen for an RR can be a lie, allowing the
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call to extract_name() at rfc1025.c:952 to advance the value of p1
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past the calculated end of the record. The makes the calculation
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of bytes remaining in the RR underflow to a huge number and results
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in a massive heap OOB read and certain crash.
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CVE: CVE-2026-5172
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Upstream-Status: Backport [https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=073082ddc0aba7b8efa15a688d6183463b65effa]
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Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
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---
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src/rfc1035.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/rfc1035.c b/src/rfc1035.c
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index 387d894a..32dc5711 100644
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--- a/src/rfc1035.c
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+++ b/src/rfc1035.c
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@@ -932,7 +932,8 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
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/* Name, extract it then re-encode. */
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int len;
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- if (!extract_name(header, qlen, &p1, name, 1, 0))
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+ /* rdlen may lie, and extract_name() advances p1 past where it says the record ends. */
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+ if (!extract_name(header, qlen, &p1, name, 1, 0) || (p1 > endrr))
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{
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blockdata_free(addr.rrblock.rrdata);
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return 2;
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--
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2.43.0
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