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Resolves: RHEL-14820 - squid: squid: denial of Servicein FTP

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Resolves: RHEL-14809 - squid: squid: Denial of Service in HTTP Digest
  Authentication
Resolves: RHEL-14781 - squid: squid: Request/Response smuggling in HTTP/1.1
  and ICAP
This commit is contained in:
Luboš Uhliarik 2023-11-12 05:29:58 +01:00
parent 4a1fd2e109
commit 9e13207eac
4 changed files with 284 additions and 1 deletions
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178
squid-5.5-CVE-2023-46846.patch Normal file
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@ -0,0 +1,178 @@
From 05f6af2f4c85cc99323cfff6149c3d74af661b6d Mon Sep 17 00:00:00 2001
From: Amos Jeffries <yadij@users.noreply.github.com>
Date: Fri, 13 Oct 2023 08:44:16 +0000
Subject: [PATCH] RFC 9112: Improve HTTP chunked encoding compliance (#1498)
---
src/http/one/Parser.cc | 8 +-------
src/http/one/Parser.h | 4 +---
src/http/one/TeChunkedParser.cc | 23 ++++++++++++++++++-----
src/parser/Tokenizer.cc | 12 ++++++++++++
src/parser/Tokenizer.h | 7 +++++++
5 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/src/http/one/Parser.cc b/src/http/one/Parser.cc
index c78ddd7f0..291ae39f0 100644
--- a/src/http/one/Parser.cc
+++ b/src/http/one/Parser.cc
@@ -65,16 +65,10 @@ Http::One::Parser::DelimiterCharacters()
void
Http::One::Parser::skipLineTerminator(Tokenizer &tok) const
{
- if (tok.skip(Http1::CrLf()))
- return;
-
if (Config.onoff.relaxed_header_parser && tok.skipOne(CharacterSet::LF))
return;
- if (tok.atEnd() || (tok.remaining().length() == 1 && tok.remaining().at(0) == '\r'))
- throw InsufficientInput();
-
- throw TexcHere("garbage instead of CRLF line terminator");
+ tok.skipRequired("line-terminating CRLF", Http1::CrLf());
}
/// all characters except the LF line terminator
diff --git a/src/http/one/Parser.h b/src/http/one/Parser.h
index f83c01a9a..aab895583 100644
--- a/src/http/one/Parser.h
+++ b/src/http/one/Parser.h
@@ -124,9 +124,7 @@ protected:
* detect and skip the CRLF or (if tolerant) LF line terminator
* consume from the tokenizer.
*
- * \throws exception on bad or InsuffientInput.
- * \retval true only if line terminator found.
- * \retval false incomplete or missing line terminator, need more data.
+ * \throws exception on bad or InsufficientInput
*/
void skipLineTerminator(Tokenizer &) const;
diff --git a/src/http/one/TeChunkedParser.cc b/src/http/one/TeChunkedParser.cc
index 1434100b6..8bdb65abb 100644
--- a/src/http/one/TeChunkedParser.cc
+++ b/src/http/one/TeChunkedParser.cc
@@ -91,6 +91,11 @@ Http::One::TeChunkedParser::parseChunkSize(Tokenizer &tok)
{
Must(theChunkSize <= 0); // Should(), really
+ static const SBuf bannedHexPrefixLower("0x");
+ static const SBuf bannedHexPrefixUpper("0X");
+ if (tok.skip(bannedHexPrefixLower) || tok.skip(bannedHexPrefixUpper))
+ throw TextException("chunk starts with 0x", Here());
+
int64_t size = -1;
if (tok.int64(size, 16, false) && !tok.atEnd()) {
if (size < 0)
@@ -121,7 +126,7 @@ Http::One::TeChunkedParser::parseChunkMetadataSuffix(Tokenizer &tok)
// bad or insufficient input, like in the code below. TODO: Expand up.
try {
parseChunkExtensions(tok); // a possibly empty chunk-ext list
- skipLineTerminator(tok);
+ tok.skipRequired("CRLF after [chunk-ext]", Http1::CrLf());
buf_ = tok.remaining();
parsingStage_ = theChunkSize ? Http1::HTTP_PARSE_CHUNK : Http1::HTTP_PARSE_MIME;
return true;
@@ -132,12 +137,14 @@ Http::One::TeChunkedParser::parseChunkMetadataSuffix(Tokenizer &tok)
// other exceptions bubble up to kill message parsing
}
-/// Parses the chunk-ext list (RFC 7230 section 4.1.1 and its Errata #4667):
+/// Parses the chunk-ext list (RFC 9112 section 7.1.1:
/// chunk-ext = *( BWS ";" BWS chunk-ext-name [ BWS "=" BWS chunk-ext-val ] )
void
-Http::One::TeChunkedParser::parseChunkExtensions(Tokenizer &tok)
+Http::One::TeChunkedParser::parseChunkExtensions(Tokenizer &callerTok)
{
do {
+ auto tok = callerTok;
+
ParseBws(tok); // Bug 4492: IBM_HTTP_Server sends SP after chunk-size
if (!tok.skip(';'))
@@ -145,6 +152,7 @@ Http::One::TeChunkedParser::parseChunkExtensions(Tokenizer &tok)
parseOneChunkExtension(tok);
buf_ = tok.remaining(); // got one extension
+ callerTok = tok;
} while (true);
}
@@ -158,11 +166,14 @@ Http::One::ChunkExtensionValueParser::Ignore(Tokenizer &tok, const SBuf &extName
/// Parses a single chunk-ext list element:
/// chunk-ext = *( BWS ";" BWS chunk-ext-name [ BWS "=" BWS chunk-ext-val ] )
void
-Http::One::TeChunkedParser::parseOneChunkExtension(Tokenizer &tok)
+Http::One::TeChunkedParser::parseOneChunkExtension(Tokenizer &callerTok)
{
+ auto tok = callerTok;
+
ParseBws(tok); // Bug 4492: ICAP servers send SP before chunk-ext-name
const auto extName = tok.prefix("chunk-ext-name", CharacterSet::TCHAR);
+ callerTok = tok; // in case we determine that this is a valueless chunk-ext
ParseBws(tok);
@@ -176,6 +187,8 @@ Http::One::TeChunkedParser::parseOneChunkExtension(Tokenizer &tok)
customExtensionValueParser->parse(tok, extName);
else
ChunkExtensionValueParser::Ignore(tok, extName);
+
+ callerTok = tok;
}
bool
@@ -209,7 +222,7 @@ Http::One::TeChunkedParser::parseChunkEnd(Tokenizer &tok)
Must(theLeftBodySize == 0); // Should(), really
try {
- skipLineTerminator(tok);
+ tok.skipRequired("chunk CRLF", Http1::CrLf());
buf_ = tok.remaining(); // parse checkpoint
theChunkSize = 0; // done with the current chunk
parsingStage_ = Http1::HTTP_PARSE_CHUNK_SZ;
diff --git a/src/parser/Tokenizer.cc b/src/parser/Tokenizer.cc
index edaffd8d3..15df793b8 100644
--- a/src/parser/Tokenizer.cc
+++ b/src/parser/Tokenizer.cc
@@ -147,6 +147,18 @@ Parser::Tokenizer::skipAll(const CharacterSet &tokenChars)
return success(prefixLen);
}
+void
+Parser::Tokenizer::skipRequired(const char *description, const SBuf &tokenToSkip)
+{
+ if (skip(tokenToSkip) || tokenToSkip.isEmpty())
+ return;
+
+ if (tokenToSkip.startsWith(buf_))
+ throw InsufficientInput();
+
+ throw TextException(ToSBuf("cannot skip ", description), Here());
+}
+
bool
Parser::Tokenizer::skipOne(const CharacterSet &chars)
{
diff --git a/src/parser/Tokenizer.h b/src/parser/Tokenizer.h
index 7bae1ccbb..3cfa7dd6c 100644
--- a/src/parser/Tokenizer.h
+++ b/src/parser/Tokenizer.h
@@ -115,6 +115,13 @@ public:
*/
SBuf::size_type skipAll(const CharacterSet &discardables);
+ /** skips a given character sequence (string);
+ * does nothing if the sequence is empty
+ *
+ * \throws exception on mismatching prefix or InsufficientInput
+ */
+ void skipRequired(const char *description, const SBuf &tokenToSkip);
+
/** Removes a single trailing character from the set.
*
* \return whether a character was removed
--
2.25.1

43
squid-5.5-CVE-2023-46847.patch Normal file
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@ -0,0 +1,43 @@
From 052cf082b0faaef4eaaa4e94119d7a1437aac4a3 Mon Sep 17 00:00:00 2001
From: squidadm <squidadm@users.noreply.github.com>
Date: Wed, 18 Oct 2023 04:50:56 +1300
Subject: [PATCH] Fix stack buffer overflow when parsing Digest Authorization
(#1517)
The bug was discovered and detailed by Joshua Rogers at
https://megamansec.github.io/Squid-Security-Audit/digest-overflow.html
where it was filed as "Stack Buffer Overflow in Digest Authentication".
---------
Co-authored-by: Alex Bason <nonsleepr@gmail.com>
Co-authored-by: Amos Jeffries <yadij@users.noreply.github.com>
---
src/auth/digest/Config.cc | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/auth/digest/Config.cc b/src/auth/digest/Config.cc
index d42831a55..be9f3c433 100644
--- a/src/auth/digest/Config.cc
+++ b/src/auth/digest/Config.cc
@@ -844,11 +844,15 @@ Auth::Digest::Config::decode(char const *proxy_auth, const HttpRequest *request,
break;
case DIGEST_NC:
- if (value.size() != 8) {
+ if (value.size() == 8) {
+ // for historical reasons, the nc value MUST be exactly 8 bytes
+ static_assert(sizeof(digest_request->nc) == 8 + 1, "bad nc buffer size");
+ xstrncpy(digest_request->nc, value.rawBuf(), value.size() + 1);
+ debugs(29, 9, "Found noncecount '" << digest_request->nc << "'");
+ } else {
debugs(29, 9, "Invalid nc '" << value << "' in '" << temp << "'");
+ digest_request->nc[0] = 0;
}
- xstrncpy(digest_request->nc, value.rawBuf(), value.size() + 1);
- debugs(29, 9, "Found noncecount '" << digest_request->nc << "'");
break;
case DIGEST_CNONCE:
--
2.25.1

46
squid-5.5-CVE-2023-46848.patch Normal file
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@ -0,0 +1,46 @@
From c67bf049871a49e9871efe50b230a7f37b7039f6 Mon Sep 17 00:00:00 2001
From: Alex Rousskov <rousskov@measurement-factory.com>
Date: Thu, 25 May 2023 02:10:28 +0000
Subject: [PATCH] Fix userinfo percent-encoding (#1367)
%X expects an unsigned int, and that is what we were giving it. However,
to get to the correct unsigned int value from a (signed) char, one has
to cast to an unsigned char (or equivalent) first.
Broken since inception in commit 7b75100.
Also adjusted similar (commented out) ext_edirectory_userip_acl code.
---
src/acl/external/eDirectory_userip/ext_edirectory_userip_acl.cc | 2 +-
src/anyp/Uri.cc | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/acl/external/eDirectory_userip/ext_edirectory_userip_acl.cc b/src/acl/external/eDirectory_userip/ext_edirectory_userip_acl.cc
index dbc20ae54..9028d1562 100644
--- a/src/acl/external/eDirectory_userip/ext_edirectory_userip_acl.cc
+++ b/src/acl/external/eDirectory_userip/ext_edirectory_userip_acl.cc
@@ -1612,7 +1612,7 @@ MainSafe(int argc, char **argv)
/* BINARY DEBUGGING *
local_printfx("while() -> bufa[%" PRIuSIZE "]: %s", k, bufa);
for (i = 0; i < k; ++i)
- local_printfx("%02X", bufa[i]);
+ local_printfx("%02X", static_cast<unsigned int>(static_cast<unsigned char>(bufa[i])));
local_printfx("\n");
* BINARY DEBUGGING */
/* Check for CRLF */
diff --git a/src/anyp/Uri.cc b/src/anyp/Uri.cc
index a6a5d5d9e..3d19188e9 100644
--- a/src/anyp/Uri.cc
+++ b/src/anyp/Uri.cc
@@ -70,7 +70,7 @@ AnyP::Uri::Encode(const SBuf &buf, const CharacterSet &ignore)
while (!tk.atEnd()) {
// TODO: Add Tokenizer::parseOne(void).
const auto ch = tk.remaining()[0];
- output.appendf("%%%02X", static_cast<unsigned int>(ch)); // TODO: Optimize using a table
+ output.appendf("%%%02X", static_cast<unsigned int>(static_cast<unsigned char>(ch))); // TODO: Optimize using a table
(void)tk.skip(ch);
if (tk.prefix(goodSection, ignore))
--
2.25.1

18
squid.spec
View File

@ -2,7 +2,7 @@
Name: squid
Version: 5.5
Release: 6%{?dist}
Release: 7%{?dist}
Summary: The Squid proxy caching server
Epoch: 7
# See CREDITS for breakdown of non GPLv2+ code
@ -52,6 +52,12 @@ Patch209: squid-5.5-halfclosed.patch
Patch501: squid-5.5-CVE-2021-46784.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2129771
Patch502: squid-5.5-CVE-2022-41318.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2245910
Patch503: squid-5.5-CVE-2023-46846.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2245916
Patch504: squid-5.5-CVE-2023-46847.patch
# https://bugzilla.redhat.com/show_bug.cgi?id=2245919
Patch505: squid-5.5-CVE-2023-46848.patch
# cache_swap.sh
Requires: bash gawk
@ -129,6 +135,9 @@ lookup program (dnsserver), a program for retrieving FTP data
%patch501 -p1 -b .CVE-2021-46784
%patch502 -p1 -b .CVE-2022-41318
%patch503 -p1 -b .CVE-2023-46846
%patch504 -p1 -b .CVE-2023-46847
%patch505 -p1 -b .CVE-2023-46848
# https://bugzilla.redhat.com/show_bug.cgi?id=1679526
# Patch in the vendor documentation and used different location for documentation
@ -355,6 +364,13 @@ fi
%changelog
* Sun Nov 12 2023 Luboš Uhliarik <luhliari@redhat.com> - 7:5.5-7
- Resolves: RHEL-14820 - squid: squid: denial of Servicein FTP
- Resolves: RHEL-14809 - squid: squid: Denial of Service in HTTP Digest
Authentication
- Resolves: RHEL-14781 - squid: squid: Request/Response smuggling in HTTP/1.1
and ICAP
* Wed Aug 16 2023 Luboš Uhliarik <luhliari@redhat.com> - 7:5.5-6
- Resolves: #2231827 - Crash with half_closed_client on