Gnulib prior 2018-09-23 vasnprintf.c convert_to_decimal memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

A vulnerability was found in Gnulib. It has been rated as critical. Affected by this issue is the function convert_to_decimal of the file vasnprintf.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The convert_to_decimal function in vasnprintf.c in Gnulib before 2018-09-23 has a heap-based buffer overflow because memory is not allocated for a trailing '\0' character during %f processing.

The bug was discovered 09/19/2018. The weakness was released 10/03/2018 (Website). The advisory is available at github.com. This vulnerability is handled as CVE-2018-17942 since 10/03/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 120359 (Fedora 29 : coreutils (2018-3a25355ab6)), 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.

Upgrading to version 2018-09-23 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (120359).

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

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Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 120359
Nessus Name: Fedora 29 : coreutils (2018-3a25355ab6)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Gnulib 2018-09-23
Patch: github.com

Timelineinfo

09/19/2018 🔍
09/23/2018 +3 days 🔍
10/03/2018 +10 days 🔍
10/03/2018 +0 days 🔍
10/03/2018 +0 days 🔍
10/04/2018 +1 days 🔍
01/03/2019 +91 days 🔍
05/22/2023 +1600 days 🔍

Sourcesinfo

Advisory: 278b4175c9d7dd47c1a3071554aac02add3b3c35
Status: Not defined

CVE: CVE-2018-17942 (🔍)

Entryinfo

Created: 10/04/2018 08:15 AM
Updated: 05/22/2023 08:29 AM
Changes: 10/04/2018 08:15 AM (65), 03/29/2020 03:49 PM (1), 05/22/2023 08:28 AM (5), 05/22/2023 08:29 AM (1)
Complete: 🔍
Cache ID: 18:02C:40

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