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Heap-based Buffer Overflow Affecting gpac4ios package, versions >=0.0.0

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.21% (59th percentile)
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NVD
8.8 high

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  • Snyk ID SNYK-COCOAPODS-GPAC4IOS-1567331
  • published 19 Aug 2021
  • disclosed 19 Aug 2021
  • credit Cisco Talos
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Introduced: 19 Aug 2021

CVE-2021-21837 Open this link in a new tab
CWE-122 Open this link in a new tab

How to fix?

There is no fixed version for GPAC4iOS.

Overview

GPAC4iOS is a GPAC4iOS is the libgpac library packaged for iOS as a Pod. It is preconfigured and tested to do a single task: create a MP4 file from a raw H.264 and an audio track.

Affected versions of this package are vulnerable to Heap-based Buffer Overflow. The function that is dispatched to parse the atom for the fecr FOURCC code is as follows. At line 23, the library will read a u32 for the number of entries from the input. After verifying that this data is available in the input, at line 24 the library will multiply the number of entries by the size of the FECReservoirEntry. Due to an integer overflow, on 32-bit systems this can result in the allocation being of a smaller size than required. After verifying the buffer has been successfully allocated, at line 25 the library will read integers from the input into the undersized buffer. This will write past the boundaries of the undersized allocation, resulting in a heap-based buffer overflow.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package