Linux Kernel up to 4.9.35/4.10 xt_TCPMSS.c tcpmss_mangle_packet Packet use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.9.35/4.10 and classified as critical. Impacted is the function tcpmss_mangle_packet of the file net/netfilter/xt_TCPMSS.c. Performing a manipulation as part of Packet results in use after free. This vulnerability was named CVE-2017-18017. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.9.35/4.10 (Operating System). This affects the function tcpmss_mangle_packet of the file net/netfilter/xt_TCPMSS.c. The manipulation as part of a Packet leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.

The bug was discovered 04/08/2017. The weakness was presented 01/03/2018 (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2017-18017 since 01/03/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 270 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 106406 (EulerOS 2.0 SP1 : kernel (EulerOS-SA-2018-1031)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Huawei Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157858 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2018-4268)).

Upgrading to version 4.9.36 or 4.11 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106406), SecurityFocus (BID 102367†) and CERT Bund (WID-SEC-2022-0532). See VDB-110197, VDB-110288, VDB-110317 and VDB-111171 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Oracle Linux
  • Debian Linux
  • Open Source Linux Kernel
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle VM
  • NetApp FAS
  • Avaya Aura Communication Manager
  • Avaya Aura Session Manager
  • Avaya Aura Application Enablement Services
  • Avaya Aura System Manager
  • Avaya Aura Experience Portal
  • NetApp AFF

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106406
Nessus Name: EulerOS 2.0 SP1 : kernel (EulerOS-SA-2018-1031)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864875
OpenVAS Name: Ubuntu Update for linux USN-3583-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Kernel 4.9.36/4.11
Patch: git.kernel.org

Timelineinfo

04/08/2017 🔍
01/03/2018 +270 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/04/2018 +1 days 🔍
01/26/2018 +22 days 🔍
01/29/2018 +3 days 🔍
09/14/2025 +2785 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:0676
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-18017 (🔍)
GCVE (CVE): GCVE-0-2017-18017
GCVE (VulDB): GCVE-100-111303

OVAL: 🔍

SecurityFocus: 102367 - Linux Kernel 'net/netfilter/xt_TCPMSS.c' Denial of Service Vulnerability
CERT Bund: WID-SEC-2022-0532 - Linux Kernel: Mehrere Schwachstellen

See also: 🔍

Entryinfo

Created: 01/04/2018 07:38
Updated: 09/14/2025 02:02
Changes: 01/04/2018 07:38 (80), 12/19/2019 14:41 (6), 01/20/2023 09:04 (5), 01/03/2025 13:21 (15), 09/14/2025 02:02 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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