CVE Vulnerabilities

CVE-2018-12320

Use After Free

Published: Jun 13, 2018 | Modified: Aug 02, 2018
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

There is a use after free in radare2 2.6.0 in r_anal_bb_free() in libr/anal/bb.c via a crafted Java binary file.

Weakness

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

Affected Software

Name Vendor Start Version End Version
Radare2 Radare 2.6.0 (including) 2.6.0 (including)
Radare2 Ubuntu artful *
Radare2 Ubuntu bionic *
Radare2 Ubuntu cosmic *
Radare2 Ubuntu disco *
Radare2 Ubuntu eoan *
Radare2 Ubuntu groovy *
Radare2 Ubuntu lunar *
Radare2 Ubuntu mantic *
Radare2 Ubuntu trusty *
Radare2 Ubuntu xenial *

Extended Description

The use of previously-freed memory can have any number of adverse consequences, ranging from the corruption of valid data to the execution of arbitrary code, depending on the instantiation and timing of the flaw. The simplest way data corruption may occur involves the system’s reuse of the freed memory. Use-after-free errors have two common and sometimes overlapping causes:

In this scenario, the memory in question is allocated to another pointer validly at some point after it has been freed. The original pointer to the freed memory is used again and points to somewhere within the new allocation. As the data is changed, it corrupts the validly used memory; this induces undefined behavior in the process. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.

Potential Mitigations

References