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From c69c5c62775d84aa56a43bedaa4fcacbb73d403d Mon Sep 17 00:00:00 2001
From: Damien Neil <dneil@google.com>
Date: Tue, 14 May 2024 14:39:10 -0700
Subject: [PATCH] [Backport] archive/zip: treat truncated EOCDR comment as an
error
CVE: CVE-2024-24789
Reference: https://go-review.googlesource.com/c/go/+/588796
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.
For #66869
Fixes #67554
Fixes CVE-2024-24789
Change-Id: I94e5cb028534bb5704588b8af27f1e22ea49c7c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/585397
Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit 33d725e5758bf1fea62e6c77fc70b57a828a49f5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/588796
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Signed-off-by: Ma Chang Wang machangwang@huawei.com
---
src/archive/zip/reader.go | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/archive/zip/reader.go b/src/archive/zip/reader.go
index 1fde1decc4..20356bde0e 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
--
2.33.0
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