Backport fix for CVE-2024-24789

Author: drehak

patches/012-fix-CVE-2024-24789.patch

@@ -0,0 +1,81 @@
+From 33d725e5758bf1fea62e6c77fc70b57a828a49f5 Mon Sep 17 00:00:00 2001
+From: Damien Neil <[email protected]>
+Date: Tue, 14 May 2024 14:39:10 -0700
+Subject: [PATCH] archive/zip: treat truncated EOCDR comment as an error
+
+When scanning for an end of central directory record,
+treat an EOCDR signature with a record containing a truncated
+comment as an error. Previously, we would skip over the invalid
+record and look for another one. Other implementations do not
+do this (they either consider this a hard error, or just ignore
+the truncated comment). This parser misalignment allowed
+presenting entirely different archive contents to Go programs
+and other zip decoders.
+
+Fixes #66869
+
+Change-Id: I94e5cb028534bb5704588b8af27f1e22ea49c7c6
+Reviewed-on: https://go-review.googlesource.com/c/go/+/585397
+Reviewed-by: Joseph Tsai <[email protected]>
+Reviewed-by: Dmitri Shuralyov <[email protected]>
+LUCI-TryBot-Result: Go LUCI <[email protected]>
+---
+ src/archive/zip/reader.go                      |   8 ++++++--
+ src/archive/zip/reader_test.go                 |   8 ++++++++
+ src/archive/zip/testdata/comment-truncated.zip | Bin 0 -> 216 bytes
+ 3 files changed, 14 insertions(+), 2 deletions(-)
+ create mode 100644 src/archive/zip/testdata/comment-truncated.zip
+
+diff --git a/src/archive/zip/reader.go b/src/archive/zip/reader.go
+index ff6fedf632..60b34b76ee 100644
+--- a/src/archive/zip/reader.go
++++ b/src/archive/zip/reader.go
+@@ -699,9 +699,13 @@ func findSignatureInBlock(b []byte) int {
+ 		if b[i] == 'P' && b[i+1] == 'K' && b[i+2] == 0x05 && b[i+3] == 0x06 {
+ 			// n is length of comment
+ 			n := int(b[i+directoryEndLen-2]) | int(b[i+directoryEndLen-1])<<8
+-			if n+directoryEndLen+i <= len(b) {
+-				return i
++			if n+directoryEndLen+i > len(b) {
++				// Truncated comment.
++				// Some parsers (such as Info-ZIP) ignore the truncated comment
++				// rather than treating it as a hard error.
++				return -1
+ 			}
++			return i
+ 		}
+ 	}
+ 	return -1
+diff --git a/src/archive/zip/reader_test.go b/src/archive/zip/reader_test.go
+index 9f651da530..00e5ec3e05 100644
+--- a/src/archive/zip/reader_test.go
++++ b/src/archive/zip/reader_test.go
+@@ -570,6 +570,14 @@ var tests = []ZipTest{
+ 			},
+ 		},
+ 	},
++	// Issue 66869: Don't skip over an EOCDR with a truncated comment.
++	// The test file sneakily hides a second EOCDR before the first one;
++	// previously we would extract one file ("file") from this archive,
++	// while most other tools would reject the file or extract a different one ("FILE").
++	{
++		Name:  "comment-truncated.zip",
++		Error: ErrFormat,
++	},
+ }
+ 
+ func TestReader(t *testing.T) {
+diff --git a/src/archive/zip/testdata/comment-truncated.zip b/src/archive/zip/testdata/comment-truncated.zip
+new file mode 100644
+index 0000000000000000000000000000000000000000..1bc19a85575964f378a8a30f198ed6ba5360aa7d
+GIT binary patch
+literal 216
+zcmWIWW@cf4gUWrGI~jpI5C#dmdHT2ppr}ax{CO=%28Pozb5c_hOA-UT8JU2>aDc83
+pE&*nMbOm^`vVk~^KxhP{)xa|7=AgR>tO!m(+=pt;1fVP<0{|c)7RUeq
+
+literal 0
+HcmV?d00001
+
+-- 
+2.46.0
+