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archive/zip: fix panic in Reader.Open

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When operating on a Zip file that contains a file prefixed with "../",
Open(...) would cause a panic in toValidName when attempting to strip
the prefixed path components.

Fixes CVE-2021-27919
Fixes #44916

Change-Id: Ic755d8126cb0897e2cbbdacf572439c38dde7b35
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1004761
Reviewed-by: Filippo Valsorda <valsorda@google.com>
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-by: Katie Hockman <katiehockman@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/300489
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
This commit is contained in:
Roland Shoemaker 2021-03-02 10:00:53 -08:00 committed by Filippo Valsorda
parent 1811aeae66
commit cd3b4ca9f2
2 changed files with 36 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/archive/zip/reader.go
View File

@ -664,7 +664,7 @@ func toValidName(name string) string {
if strings.HasPrefix(p, "/") { if strings.HasPrefix(p, "/") {
p = p[len("/"):] p = p[len("/"):]
} }
for strings.HasPrefix(name, "../") { for strings.HasPrefix(p, "../") {
p = p[len("../"):] p = p[len("../"):]
} }
return p return p

35
src/archive/zip/reader_test.go
View File

@ -1081,3 +1081,38 @@ func TestFS(t *testing.T) {
t.Fatal(err) t.Fatal(err)
} }
} }
func TestCVE202127919(t *testing.T) {
// Archive containing only the file "../test.txt"
data := []byte{
0x50, 0x4b, 0x03, 0x04, 0x14, 0x00, 0x08, 0x00,
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x2e, 0x2e,
0x2f, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x74, 0x78,
0x74, 0x0a, 0xc9, 0xc8, 0x2c, 0x56, 0xc8, 0x2c,
0x56, 0x48, 0x54, 0x28, 0x49, 0x2d, 0x2e, 0x51,
0x28, 0x49, 0xad, 0x28, 0x51, 0x48, 0xcb, 0xcc,
0x49, 0xd5, 0xe3, 0x02, 0x04, 0x00, 0x00, 0xff,
0xff, 0x50, 0x4b, 0x07, 0x08, 0xc0, 0xd7, 0xed,
0xc3, 0x20, 0x00, 0x00, 0x00, 0x1a, 0x00, 0x00,
0x00, 0x50, 0x4b, 0x01, 0x02, 0x14, 0x00, 0x14,
0x00, 0x08, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00,
0x00, 0xc0, 0xd7, 0xed, 0xc3, 0x20, 0x00, 0x00,
0x00, 0x1a, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2e,
0x2e, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x74,
0x78, 0x74, 0x50, 0x4b, 0x05, 0x06, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x39, 0x00,
0x00, 0x00, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00,
}
r, err := NewReader(bytes.NewReader([]byte(data)), int64(len(data)))
if err != nil {
t.Fatalf("Error reading the archive: %v", err)
}
_, err = r.Open("test.txt")
if err != nil {
t.Errorf("Error reading file: %v", err)
}
}