GNU C Library up to 2.25 DNS Stub Resolver IP Fragment data processing

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in GNU C Library up to 2.25. This issue affects some unknown processing of the component DNS Stub Resolver. The manipulation as part of IP Fragment results in data processing. This vulnerability is identified as CVE-2017-12133. 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 critical, was found in GNU C Library up to 2.25 (Software Library). Affected is an unknown function of the component DNS Stub Resolver. The manipulation as part of a IP Fragment leads to a data processing vulnerability. CWE is classifying the issue as CWE-19. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The DNS stub resolver in the GNU C Library (glibc) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attackers due to IP fragmentation.

The bug was discovered 02/08/2017. The weakness was released 09/07/2017 by Florian Weimer (Website). The advisory is shared for download at lists.fedoraproject.org. This vulnerability is traded as CVE-2017-12133 since 08/01/2017. 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 vulnerability was handled as a non-public zero-day exploit for at least 208 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 102933 (Fedora 25 : glibc (2017-270ab2baa3)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171013 (SUSE Enterprise Linux Security Update for glibc (SUSE-SU-2018:0874-1)).

Upgrading to version 2.26 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (102933) and SecurityFocus (BID 100679†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Data processing
CWE: CWE-19
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: 102933
Nessus Name: Fedora 25 : glibc (2017-270ab2baa3)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for glibc FEDORA-2017-270ab2baa3
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: C Library 2.26
Patch: d42eed4a044e5e10dfb885cf9891c2518a72a491

Timelineinfo

02/08/2017 🔍
08/01/2017 +174 days 🔍
08/02/2017 +1 days 🔍
09/04/2017 +33 days 🔍
09/05/2017 +1 days 🔍
09/07/2017 +2 days 🔍
09/07/2017 +0 days 🔍
09/08/2017 +1 days 🔍
12/28/2022 +1937 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: FEDORA-2017-270ab2baa3
Researcher: Florian Weimer
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-12133 (🔍)
GCVE (CVE): GCVE-0-2017-12133
GCVE (VulDB): GCVE-100-106176
SecurityFocus: 100679 - GNU glibc CVE-2017-12133 Use After Free Information Disclosure Vulnerability

Entryinfo

Created: 09/08/2017 09:07
Updated: 12/28/2022 07:30
Changes: 09/08/2017 09:07 (70), 11/13/2019 11:39 (11), 12/28/2022 07:25 (5), 12/28/2022 07:30 (1)
Complete: 🔍
Cache ID: 216::103

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