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# Exploit Title: DoS Wechat with an emoji # Date: 16-May-2019 # Exploit Author: Hong Nhat Pham # Vendor Homepage: http://www.tencent.com/en-us/index.html # Software Link: https://play.google.com/store/apps/details?id=com.tencent.mm # Version: 7.0.4 # Tested on: Android 9.0 # CVE : CVE-2019-11419 Description: vcodec2_hls_filter in libvoipCodec_v7a.so in WeChat application for Android results in a DoS by replacing an emoji file (under the /sdcard/tencent/MicroMsg directory) with a crafted .wxgf file. Crash-log is provided in poc.zip file at https://drive.google.com/open?id=1HFQtbD10awuUicdWoq3dKVKfv0wvxOKS Vulnerability Type: Denial of Service Vendor of Product: Tencent Affected Product Code Base: WeChat for Android - Up to latest version (7.0.4) Affected Component: Function vcodec2_hls_filter in libvoipCodec_v7a.so Attack Type: Local Attack vector: An malware app can crafts a malicious emoji file and overwrites the emoji files under /sdcard/tencent/MicroMsg/[User_ID]/emoji/[WXGF_ID]. Once the user opens any chat messages that contain an emoji, WeChat will instantly crash. POC: Video at https://drive.google.com/open?id=1x1Z3hm4j8f4rhv_WUp4gW-bhdtZMezdU User must have sent or received a GIF file in WeChat Malware app must retrieve the phone’s IMEI. For POC, we can use the below command adb shell service call iphonesubinfo 1 | awk -F "'" '{print $2}' | sed '1 d' | tr -d '.' | awk '{print}' ORS=- Produce the malicious emoji file with the retrieved IMEI (use encrypt_wxgf.py in poc.zip): python encrypt.py crash4.wxgf [SIZE_OF_EMOJI_ON_SDCARD] Replace /sdcard/tencent/MicroMsg/[User_ID]/emoji/[WXGF_ID] with the padded out.wxgf.encrypted WeChat will crash now if a message that contains the overwritten emoji file Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/46853.zip |
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