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Hugo SIMELIERE (Schneider Electric)
cab6f6c603
Pick patch from [1] dnsmasq 2.90 debian bookworm pacthes. [1] https://sources.debian.org/src/dnsmasq/2.90-4~deb12u2/debian/patches/CVE-2026-4891.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>
45 lines
1.4 KiB
Diff
45 lines
1.4 KiB
Diff
From 046fe2393ea47622b8e1c3e0c6dcca8347a6c431 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Wed, 25 Mar 2026 23:04:08 +0000
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Subject: [PATCH] Verify rdlen field in RRSIG packets. CVE-2026-4891
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Bug report from Royce M <royce@xchglabs.com>
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This avoids crafted packets which give a value for rdlen _less_
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then the space taken up by the fixed data and the signer's name
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and engender a negative calculated length for the signature.
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CVE: CVE-2026-4891
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Upstream-Status: Backport [https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=788b4e0f6c05217981b512bed4e5fea6f8855d01]
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Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
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---
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src/dnssec.c | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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diff --git a/src/dnssec.c b/src/dnssec.c
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index 68f1b5d0..d32db5b4 100644
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--- a/src/dnssec.c
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+++ b/src/dnssec.c
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@@ -546,10 +546,14 @@ static int validate_rrset(time_t now, struct dns_header *header, size_t plen, in
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*ttl_out = ttl;
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}
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-
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+
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+ /* Don't trust rdlen not to be too small and give us a negative sig_len
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+ It has already been checked that it doesn't run us off the end
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+ of the packet. */
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+ if ((sig_len = rdlen - (p - psav)) <= 0)
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+ return STAT_BOGUS;
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+
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sig = p;
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- sig_len = rdlen - (p - psav);
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-
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nsigttl = htonl(orig_ttl);
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hash->update(ctx, 18, psav);
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--
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2.43.0
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