Apache Tomcat up to 7.0.86/8.0.51/8.5.30/9.0.7 UTF-8 Decoder resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Apache Tomcat up to 7.0.86/8.0.51/8.5.30/9.0.7. Impacted is an unknown function of the component UTF-8 Decoder. The manipulation results in resource consumption. This vulnerability is identified as CVE-2018-1336. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Apache Tomcat up to 7.0.86/8.0.51/8.5.30/9.0.7 (Application Server Software). Affected is an unknown function of the component UTF-8 Decoder. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.

The bug was discovered 04/06/2018. The weakness was released 08/02/2018 (Website). The advisory is shared for download at mail-archives.us.apache.org. This vulnerability is traded as CVE-2018-1336 since 12/06/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability was handled as a non-public zero-day exploit for at least 118 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 112185 (Debian DSA-4281-1 : tomcat8 - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197211 (Ubuntu Security Notification for Tomcat7, Tomcat8 Vulnerabilities (USN-3723-1)).

Upgrading 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 (112185) and SecurityFocus (BID 104898†). Entries connected to this vulnerability are available at VDB-117151 and VDB-122531. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
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: 112185
Nessus Name: Debian DSA-4281-1 : tomcat8 - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

12/06/2017 🔍
04/06/2018 +120 days 🔍
07/22/2018 +107 days 🔍
08/02/2018 +10 days 🔍
08/02/2018 +0 days 🔍
08/03/2018 +1 days 🔍
08/29/2018 +26 days 🔍
08/30/2018 +1 days 🔍
04/29/2023 +1703 days 🔍

Sourcesinfo

Vendor: apache.org

Advisory: RHSA-2018:2700
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1336 (🔍)
GCVE (CVE): GCVE-0-2018-1336
GCVE (VulDB): GCVE-100-122556

OVAL: 🔍

SecurityFocus: 104898 - Apache Tomcat CVE-2018-1336 Denial of Service Vulnerability
SecurityTracker: 1041375

See also: 🔍

Entryinfo

Created: 08/03/2018 07:32
Updated: 04/29/2023 13:13
Changes: 08/03/2018 07:32 (75), 03/12/2020 21:08 (6), 04/29/2023 13:13 (5)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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