GNU C Library up to 2.28 getaddrinfo Hostname input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in GNU C Library up to 2.28. This affects the function getaddrinfo. This manipulation as part of Hostname causes input validation. This vulnerability is registered as CVE-2018-19591. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in GNU C Library up to 2.28 (Software Library). It has been declared as critical. Affected by this vulnerability is the function getaddrinfo. The manipulation as part of a Hostname leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

The bug was discovered 11/27/2018. The weakness was published 12/04/2018 (Website). The advisory is shared at lists.fedoraproject.org. This vulnerability is known as CVE-2018-19591 since 11/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 120918 (Fedora 29 : glibc (2018-f6b7df660d)), 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 351477 (Amazon Linux Security Advisory for glibc: ALAS2-2019-1140).

Upgrading 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 (120918) and SecurityFocus (BID 106037†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: 120918
Nessus Name: Fedora 29 : glibc (2018-f6b7df660d)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: d527c860f5a3f0ed687bd03f0cb464612dc23408

Timelineinfo

11/26/2018 🔍
11/27/2018 +1 days 🔍
11/27/2018 +0 days 🔍
11/30/2018 +3 days 🔍
12/04/2018 +4 days 🔍
12/04/2018 +0 days 🔍
12/05/2018 +1 days 🔍
01/03/2019 +29 days 🔍
12/03/2025 +2526 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: FEDORA-2018-f6b7df660d
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-19591 (🔍)
GCVE (CVE): GCVE-0-2018-19591
GCVE (VulDB): GCVE-100-127465
SecurityFocus: 106037 - GNU glibc 'sysdeps/unix/sysv/linux/if_index.c' Remote Denial of Service Vulnerability
SecurityTracker: 1042174

Entryinfo

Created: 12/05/2018 08:13
Updated: 12/03/2025 21:18
Changes: 12/05/2018 08:13 (73), 04/17/2020 10:56 (5), 06/12/2023 16:12 (7), 06/12/2023 16:19 (1), 12/03/2025 21:18 (18)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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