XNU IPComp on macOS memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in XNU IPComp on macOS. Affected is an unknown function. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2019-8717. The attack may be initiated remotely. In addition, an exploit is available. It is advised to disable the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in XNU IPComp on macOS (version now known). This affects some unknown processing. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 10/09/2019 by Google Security Research as EDB-ID 47479 as not defined exploit (Exploit-DB). The advisory is shared at exploit-db.com. This vulnerability is uniquely identified as CVE-2019-8717 since 02/18/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available. The advisory points out:

This report describes a bug in the XNU implementation of the IPComp protocol (https://tools.ietf.org/html/rfc3173). This bug can be remotely triggered by an attacker who is able to send traffic to a macOS system (iOS AFAIK isn't affected) *over two network interfaces at the same time*.

A public exploit has been developed by Google Security Research and been published immediately after the advisory. The exploit is shared for download at github.com. It is declared as proof-of-concept.

The best possible mitigation is suggested to be disabling the affected component. The exploit contains the following remark:

I believe that by far the best way to fix this issue is to rip out the entire feature. Unless I'm missing some way for the initialization to succeed, it looks like nobody can have successfully used this feature in the last few years; and apparently nobody felt strongly enough about that to get the feature fixed.

The vulnerability is also documented in the vulnerability database at Exploit-DB (47479). See VDB-142348, VDB-147402 and VDB-147428 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Google Security Research
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Disable
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

02/18/2019 🔍
10/09/2019 +233 days 🔍
10/09/2019 +0 days 🔍
10/09/2019 +0 days 🔍
10/11/2019 +2 days 🔍
01/08/2025 +1916 days 🔍

Sourcesinfo

Advisory: EDB-ID 47479
Researcher: Google Security Research
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-8717 (🔍)
GCVE (CVE): GCVE-0-2019-8717
GCVE (VulDB): GCVE-100-143373
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 10/11/2019 09:55
Updated: 01/08/2025 01:37
Changes: 10/11/2019 09:55 (65), 10/01/2020 18:43 (2), 01/08/2024 08:10 (4), 01/08/2025 01:37 (18)
Complete: 🔍
Submitter: misc
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #94: XNU - Remote Double-Free via Data Race in IPComp Input Path (by misc)

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