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44 lines
1.7 KiB
44 lines
1.7 KiB
9 months ago
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From 052cf082b0faaef4eaaa4e94119d7a1437aac4a3 Mon Sep 17 00:00:00 2001
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From: squidadm <squidadm@users.noreply.github.com>
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Date: Wed, 18 Oct 2023 04:50:56 +1300
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Subject: [PATCH] Fix stack buffer overflow when parsing Digest Authorization
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(#1517)
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The bug was discovered and detailed by Joshua Rogers at
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https://megamansec.github.io/Squid-Security-Audit/digest-overflow.html
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where it was filed as "Stack Buffer Overflow in Digest Authentication".
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---------
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Co-authored-by: Alex Bason <nonsleepr@gmail.com>
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Co-authored-by: Amos Jeffries <yadij@users.noreply.github.com>
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---
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src/auth/digest/Config.cc | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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diff --git a/src/auth/digest/Config.cc b/src/auth/digest/Config.cc
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index d42831a55..be9f3c433 100644
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--- a/src/auth/digest/Config.cc
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+++ b/src/auth/digest/Config.cc
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@@ -844,11 +844,15 @@ Auth::Digest::Config::decode(char const *proxy_auth, const HttpRequest *request,
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break;
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case DIGEST_NC:
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- if (value.size() != 8) {
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+ if (value.size() == 8) {
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+ // for historical reasons, the nc value MUST be exactly 8 bytes
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+ static_assert(sizeof(digest_request->nc) == 8 + 1, "bad nc buffer size");
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+ xstrncpy(digest_request->nc, value.rawBuf(), value.size() + 1);
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+ debugs(29, 9, "Found noncecount '" << digest_request->nc << "'");
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+ } else {
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debugs(29, 9, "Invalid nc '" << value << "' in '" << temp << "'");
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+ digest_request->nc[0] = 0;
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}
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- xstrncpy(digest_request->nc, value.rawBuf(), value.size() + 1);
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- debugs(29, 9, "Found noncecount '" << digest_request->nc << "'");
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break;
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case DIGEST_CNONCE:
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--
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2.25.1
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