Merge commit from fork

🔒 Prevent runaway memory use when parsing `uid-set` (v0.3 backport)
ruby · Feb 7, 2025 · cb92191 · cb92191
2 parents 4681194 + 524f2a8
commit cb92191
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diff --git a/lib/net/imap/response_parser.rb b/lib/net/imap/response_parser.rb
@@ -7,6 +7,8 @@ class IMAP < Protocol
 
     # Parses an \IMAP server response.
     class ResponseParser
+      MAX_UID_SET_SIZE = 10_000
+
       # :call-seq: Net::IMAP::ResponseParser.new -> Net::IMAP::ResponseParser
       def initialize
         @str = nil
@@ -1379,11 +1381,29 @@ def uid_set
         case token.symbol
         when T_NUMBER then [Integer(token.value)]
         when T_ATOM
-          token.value.split(",").flat_map {|range|
-            range = range.split(":").map {|uniqueid| Integer(uniqueid) }
-            range.size == 1 ? range : Range.new(range.min, range.max).to_a
+          entries = uid_set__ranges(token.value)
+          if (count = entries.sum(&:count)) > MAX_UID_SET_SIZE
+            parse_error("uid-set is too large: %d > 10k", count)
+          end
+          entries.flat_map(&:to_a)
+        end
+      end
+
+      # returns an array of ranges
+      def uid_set__ranges(uidset)
+        entries = []
+        uidset.split(",") do |entry|
+          uids = entry.split(":", 2).map {|uid|
+            unless uid =~ /\A[1-9][0-9]*\z/
+              parse_error("invalid uid-set uid: %p", uid)
+            end
+            uid = Integer(uid)
+            NumValidator.ensure_nz_number(uid)
+            uid
           }
+          entries << Range.new(*uids.minmax)
         end
+        entries
       end
 
       def nil_atom

diff --git a/test/net/fixtures/Makefile b/test/net/fixtures/Makefile
@@ -5,11 +5,11 @@ regen_certs:
 	make server.crt
 
 cacert.pem: server.key
-	openssl req -new -x509 -days 1825 -key server.key -out cacert.pem -text -subj "/C=JP/ST=Shimane/L=Matz-e city/O=Ruby Core Team/CN=Ruby Test CA/emailAddress=security@ruby-lang.org"
+	openssl req -new -x509 -days 3650 -key server.key -out cacert.pem -subj "/C=JP/ST=Shimane/L=Matz-e city/O=Ruby Core Team/CN=Ruby Test CA/emailAddress=security@ruby-lang.org"
 
 server.csr:
-	openssl req -new -key server.key -out server.csr -text -subj "/C=JP/ST=Shimane/O=Ruby Core Team/OU=Ruby Test/CN=localhost"
+	openssl req -new -key server.key -out server.csr -subj "/C=JP/ST=Shimane/O=Ruby Core Team/OU=Ruby Test/CN=localhost"
 
 server.crt: server.csr cacert.pem
-	openssl x509 -days 1825 -CA cacert.pem -CAkey server.key -set_serial 00 -in server.csr -req -text -out server.crt
+	openssl x509 -days 3650 -CA cacert.pem -CAkey server.key -set_serial 00 -in server.csr -req -out server.crt
 	rm server.csr
diff --git a/test/net/fixtures/cacert.pem b/test/net/fixtures/cacert.pem
@@ -1,24 +1,24 @@
 -----BEGIN CERTIFICATE-----
-MIID7TCCAtWgAwIBAgIJAIltvxrFAuSnMA0GCSqGSIb3DQEBCwUAMIGMMQswCQYD
-VQQGEwJKUDEQMA4GA1UECAwHU2hpbWFuZTEUMBIGA1UEBwwLTWF0ei1lIGNpdHkx
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-MDI1ODI4WhcNMjQwMTAxMDI1ODI4WjCBjDELMAkGA1UEBhMCSlAxEDAOBgNVBAgM
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-mA==
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+2uJX6eMWTVxYK5D4M9lm
 -----END CERTIFICATE-----
diff --git a/test/net/fixtures/server.crt b/test/net/fixtures/server.crt
@@ -1,82 +1,21 @@
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 2 (0x2)
-    Signature Algorithm: sha256WithRSAEncryption
-        Issuer: C=JP, ST=Shimane, L=Matz-e city, O=Ruby Core Team, CN=Ruby Test CA/emailAddress=security@ruby-lang.org
-        Validity
-            Not Before: Jan  2 03:27:13 2019 GMT
-            Not After : Jan  1 03:27:13 2024 GMT
-        Subject: C=JP, ST=Shimane, O=Ruby Core Team, OU=Ruby Test, CN=localhost
-        Subject Public Key Info:
-            Public Key Algorithm: rsaEncryption
-                Public-Key: (2048 bit)
-                Modulus:
-                    00:e8:da:9c:01:2e:2b:10:ec:49:cd:5e:07:13:07:
-                    9c:70:9e:c6:74:bc:13:c2:e1:6f:c6:82:fd:e3:48:
-                    e0:2c:a5:68:c7:9e:42:de:60:54:65:e6:6a:14:57:
-                    7a:30:d0:cc:b5:b6:d9:c3:d2:df:c9:25:97:54:67:
-                    cf:f6:be:5e:cb:8b:ee:03:c5:e1:e2:f9:e7:f7:d1:
-                    0c:47:f0:b8:da:33:5a:ad:41:ad:e7:b5:a2:7b:b7:
-                    bf:30:da:60:f8:e3:54:a2:bc:3a:fd:1b:74:d9:dc:
-                    74:42:e9:29:be:df:ac:b4:4f:eb:32:f4:06:f1:e1:
-                    8c:4b:a8:8b:fb:29:e7:b1:bf:1d:01:ee:73:0f:f9:
-                    40:dc:d5:15:79:d9:c6:73:d0:c0:dd:cb:e4:da:19:
-                    47:80:c6:14:04:72:fd:9a:7c:8f:11:82:76:49:04:
-                    79:cc:f2:5c:31:22:95:13:3e:5d:40:a6:4d:e0:a3:
-                    02:26:7d:52:3b:bb:ed:65:a1:0f:ed:6b:b0:3c:d4:
-                    de:61:15:5e:d3:dd:68:09:9f:4a:57:a5:c2:a9:6d:
-                    86:92:c5:f4:a4:d4:b7:13:3b:52:63:24:05:e2:cc:
-                    e3:8a:3c:d4:35:34:2b:10:bb:58:72:e7:e1:8d:1d:
-                    74:8c:61:16:20:3d:d0:1c:4e:8f:6e:fd:fe:64:10:
-                    4f:41
-                Exponent: 65537 (0x10001)
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:FALSE
-            Netscape Comment: 
-                OpenSSL Generated Certificate
-            X509v3 Subject Key Identifier: 
-                ED:28:C2:7E:AB:4B:C8:E8:FE:55:6D:66:95:31:1C:2D:60:F9:02:36
-            X509v3 Authority Key Identifier: 
-                keyid:F6:D1:22:29:D5:3D:23:D7:5E:AD:0C:9C:E6:75:8F:9D:CD:F8:9D:53
-
-    Signature Algorithm: sha256WithRSAEncryption
-         1d:b8:c5:8b:72:41:20:65:ad:27:6f:15:63:06:26:12:8d:9c:
-         ad:ca:f4:db:97:b4:90:cb:ff:35:94:bb:2a:a7:a1:ab:1e:35:
-         2d:a5:3f:c9:24:b0:1a:58:89:75:3e:81:0a:2c:4f:98:f9:51:
-         fb:c0:a3:09:d0:0a:9b:e7:a2:b7:c3:60:40:c8:f4:6d:b2:6a:
-         56:12:17:4c:00:24:31:df:9c:60:ae:b1:68:54:a9:e6:b5:4a:
-         04:e6:92:05:86:d9:5a:dc:96:30:a5:58:de:14:99:0f:e5:15:
-         89:3e:9b:eb:80:e3:bd:83:c3:ea:33:35:4b:3e:2f:d3:0d:64:
-         93:67:7f:8d:f5:3f:0c:27:bc:37:5a:cc:d6:47:16:af:5a:62:
-         d2:da:51:f8:74:06:6b:24:ad:28:68:08:98:37:7d:ed:0e:ab:
-         1e:82:61:05:d0:ba:75:a0:ab:21:b0:9a:fd:2b:54:86:1d:0d:
-         1f:c2:d4:77:1f:72:26:5e:ad:8a:9f:09:36:6d:44:be:74:c2:
-         5a:3e:ff:5c:9d:75:d6:38:7b:c5:39:f9:44:6e:a1:d1:8e:ff:
-         63:db:c4:bb:c6:91:92:ca:5c:60:9b:1d:eb:0a:de:08:ee:bf:
-         da:76:03:65:62:29:8b:f8:7f:c7:86:73:1e:f6:1f:2d:89:69:
-         fd:be:bd:6e
 -----BEGIN CERTIFICATE-----
-MIID4zCCAsugAwIBAgIBAjANBgkqhkiG9w0BAQsFADCBjDELMAkGA1UEBhMCSlAx
-EDAOBgNVBAgMB1NoaW1hbmUxFDASBgNVBAcMC01hdHotZSBjaXR5MRcwFQYDVQQK
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+uBrdP4Q=
 -----END CERTIFICATE-----
diff --git a/test/net/fixtures/server.key b/test/net/fixtures/server.key
@@ -1,28 +1,27 @@
------BEGIN PRIVATE KEY-----
-MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDo2pwBLisQ7EnN
-XgcTB5xwnsZ0vBPC4W/Ggv3jSOAspWjHnkLeYFRl5moUV3ow0My1ttnD0t/JJZdU
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-uCDk/+v3KkZPLgdrrTAih9FhJ+PVN8tMcb+6IM4SA4fFFr/UPJEwct0LJ3oQ0grJ
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-2whRF0FEjKA8ehrNhAq+VFfFNw==
------END PRIVATE KEY-----
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAsPnoGUOnrpiSqt4XynxA+HRP7S+BSObI6qJ7fQAVSPtRkqso
+tWxQYLEYzNEx5ZSHTGypibVsJylvCfuToDTfMul8b/CZjP2Ob0LdpYrNH6l5hvFE
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+k9y8a+kdoYk3BASpCHJ29M5R2KEA7YV9wrBklHTz8VzSTFTbKHEQ5W5csAhoL5Fo
+qoHzFFi3Qx7MHESQb9qHyolHEMNx6QdsHUn7rlEnaTTyrXh3ifQtD6C0yTmFXUIS
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+UjmopwKBgAqB2KYYMUqAOvYcBnEfLDmyZv9BTVNHbR2lKkMYqv5LlvDaBxVfilE0
+2riO4p6BaAdvzXjKeRrGNEKoHNBpOSfYCOM16NjL8hIZB1CaV3WbT5oY+jp7Mzd5
+7d56RZOE+ERK2uz/7JX9VSsM/LbH9pJibd4e8mikDS9ntciqOH/3
+-----END RSA PRIVATE KEY-----
diff --git a/test/net/imap/test_imap_response_parser.rb b/test/net/imap/test_imap_response_parser.rb
@@ -438,4 +438,13 @@ def test_uidplus_copyuid__uid_mapping
     )
   end
 
+  def test_uidplus_copyuid__too_large
+    parser = Net::IMAP::ResponseParser.new
+    assert_raise Net::IMAP::ResponseParseError, /uid-set is too large/ do
+      parser.parse(
+        "A004 OK [copyUID 1 10000:20000,1 1:10001] Done\r\n"
+      )
+    end
+  end
+
 end