GNU C Library up to 2.26 glob.c glob User Name memory corruption

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4.6	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in GNU C Library up to 2.26. This impacts the function glob of the file glob.c. Executing a manipulation as part of User Name can lead to memory corruption. The identification of this vulnerability is CVE-2017-15671. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in GNU C Library up to 2.26 (Software Library). It has been declared as problematic. This vulnerability affects the function glob of the file glob.c. The manipulation as part of a User Name leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27, when invoked with GLOB_TILDE, could skip freeing allocated memory when processing the ~ operator with a long user name, potentially leading to a denial of service (memory leak).

The bug was discovered 10/20/2017. The weakness was shared 10/20/2017 by Florian Weimer as Bug 22325 as not defined bug report (Bugzilla). The advisory is shared for download at sourceware.org. This vulnerability was named CVE-2017-15671 since 10/20/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 106281 (Fedora 26 : glibc (2018-8e27ad96ed)), 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 170681 (SUSE Enterprise Linux Security Update for glibc (SUSE-SU-2018:0074-1)).

Upgrading to version 2.27 eliminates this vulnerability. A possible mitigation has been published 4 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106281) and SecurityFocus (BID 101517†). The entry VDB-111894 is related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Software Library

Vendor

• GNU

Name

• C Library

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26

License

• open-source

Website

• Vendor: https://www.gnu.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 106281
Nessus Name: Fedora 26 : glibc (2018-8e27ad96ed)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 66491
OpenVAS Name: Fedora Update for glibc FEDORA-2018-8e27ad96ed
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: C Library 2.27

Timelineinfo

10/20/2017 🔍
10/20/2017 +0 days 🔍
10/20/2017 +0 days 🔍
10/20/2017 +0 days 🔍
10/20/2017 +0 days 🔍
10/21/2017 +1 days 🔍
01/23/2018 +94 days 🔍
01/24/2018 +1 days 🔍
11/27/2019 +672 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: Bug 22325
Researcher: Florian Weimer
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-15671 (🔍)
GCVE (CVE): GCVE-0-2017-15671
GCVE (VulDB): GCVE-100-108304
SecurityFocus: 101517 - GNU glibc CVE-2017-15671 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 10/21/2017 14:32
Updated: 11/27/2019 17:19
Changes: 10/21/2017 14:32 (72), 11/27/2019 17:19 (14)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

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