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Resolves: RHEL-19556 - squid: denial of service in HTTP request

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parsing (CVE-2023-50269)
This commit is contained in:
Luboš Uhliarik 2024-02-02 02:37:40 +01:00
parent 203568450c
commit a006243e29
2 changed files with 58 additions and 1 deletions
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50
squid-5.5-CVE-2023-50269.patch Normal file
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@ -0,0 +1,50 @@
diff --git a/src/ClientRequestContext.h b/src/ClientRequestContext.h
index 55a7a43..94a8700 100644
--- a/src/ClientRequestContext.h
+++ b/src/ClientRequestContext.h
@@ -80,6 +80,10 @@ public:
#endif
ErrorState *error; ///< saved error page for centralized/delayed processing
bool readNextRequest; ///< whether Squid should read after error handling
+
+#if FOLLOW_X_FORWARDED_FOR
+ size_t currentXffHopNumber = 0; ///< number of X-Forwarded-For header values processed so far
+#endif
};
#endif /* SQUID_CLIENTREQUESTCONTEXT_H */
diff --git a/src/client_side_request.cc b/src/client_side_request.cc
index f44849e..c7c09d4 100644
--- a/src/client_side_request.cc
+++ b/src/client_side_request.cc
@@ -80,6 +80,11 @@
static const char *const crlf = "\r\n";
#if FOLLOW_X_FORWARDED_FOR
+
+#if !defined(SQUID_X_FORWARDED_FOR_HOP_MAX)
+#define SQUID_X_FORWARDED_FOR_HOP_MAX 64
+#endif
+
static void clientFollowXForwardedForCheck(Acl::Answer answer, void *data);
#endif /* FOLLOW_X_FORWARDED_FOR */
@@ -485,8 +490,16 @@ clientFollowXForwardedForCheck(Acl::Answer answer, void *data)
/* override the default src_addr tested if we have to go deeper than one level into XFF */
Filled(calloutContext->acl_checklist)->src_addr = request->indirect_client_addr;
}
- calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
- return;
+ if (++calloutContext->currentXffHopNumber < SQUID_X_FORWARDED_FOR_HOP_MAX) {
+ calloutContext->acl_checklist->nonBlockingCheck(clientFollowXForwardedForCheck, data);
+ return;
+ }
+ const auto headerName = Http::HeaderLookupTable.lookup(Http::HdrType::X_FORWARDED_FOR).name;
+ debugs(28, DBG_CRITICAL, "ERROR: Ignoring trailing " << headerName << " addresses" <<
+ Debug::Extra << "addresses allowed by follow_x_forwarded_for: " << calloutContext->currentXffHopNumber <<
+ Debug::Extra << "last/accepted address: " << request->indirect_client_addr <<
+ Debug::Extra << "ignored trailing addresses: " << request->x_forwarded_for_iterator);
+ // fall through to resume clientAccessCheck() processing
}
}

9
squid.spec
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@ -2,7 +2,7 @@
Name: squid
Version: 5.5
Release: 9%{?dist}
Release: 10%{?dist}
Summary: The Squid proxy caching server
Epoch: 7
# See CREDITS for breakdown of non GPLv2+ code
@ -68,6 +68,8 @@ Patch508: squid-5.5-CVE-2023-46724.patch
Patch509: squid-5.5-CVE-2023-49285.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2252923
Patch510: squid-5.5-CVE-2023-49286.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2254663
Patch511: squid-5.5-CVE-2023-50269.patch
# cache_swap.sh
@ -154,6 +156,7 @@ lookup program (dnsserver), a program for retrieving FTP data
%patch508 -p1 -b .CVE-2023-46724
%patch509 -p1 -b .CVE-2023-49285
%patch510 -p1 -b .CVE-2023-49286
%patch511 -p1 -b .CVE-2023-50269
# https://bugzilla.redhat.com/show_bug.cgi?id=1679526
# Patch in the vendor documentation and used different location for documentation
@ -380,6 +383,10 @@ fi
%changelog
* Fri Feb 02 2024 Luboš Uhliarik <luhliari@redhat.com> - 7:5.5-10
- Resolves: RHEL-19556 - squid: denial of service in HTTP request
parsing (CVE-2023-50269)
* Thu Feb 01 2024 Luboš Uhliarik <luhliari@redhat.com> - 7:5.5-9
- Resolves: RHEL-18354 - squid: Buffer over-read in the HTTP Message processing
feature (CVE-2023-49285)