sharutils 4.15.2 unshar.c memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in sharutils 4.15.2. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file unshar.c. The manipulation leads to memory corruption. This vulnerability is known as CVE-2018-1000097. Local access is required to approach this attack. There is no exploit available. It is recommended to upgrade the affected component. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Detailsinfo

A vulnerability was found in sharutils 4.15.2. It has been classified as critical. Affected is some unknown functionality of the file unshar.c. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Sharutils sharutils (unshar command) version 4.15.2 contains a Buffer Overflow vulnerability in Affected component on the file unshar.c at line 75, function looks_like_c_code. Failure to perform checking of the buffer containing input line. that can result in Could lead to code execution. This attack appear to be exploitable via Victim have to run unshar command on a specially crafted file..

The bug was discovered 02/21/2018. The weakness was released 03/13/2018 (Website). The advisory is shared for download at seclists.org. This vulnerability is traded as CVE-2018-1000097 since 03/12/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 19 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108583 (Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : sharutils vulnerability (USN-3605-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176348 (Debian Security Update for sharutils (DSA 4167-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108583). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

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: 108583
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : sharutils vulnerability (USN-3605-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 57878
OpenVAS Name: Debian Security Advisory DSA 4167-1 (sharutils - security update)
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: 🔍

Timelineinfo

02/21/2018 🔍
03/12/2018 +19 days 🔍
03/12/2018 +0 days 🔍
03/13/2018 +1 days 🔍
03/13/2018 +0 days 🔍
03/22/2018 +9 days 🔍
03/23/2018 +1 days 🔍
02/21/2023 +1796 days 🔍

Sourcesinfo

Advisory: USN-3605-1
Status: Not defined

CVE: CVE-2018-1000097 (🔍)
GCVE (CVE): GCVE-0-2018-1000097
GCVE (VulDB): GCVE-100-114396

OVAL: 🔍

Entryinfo

Created: 03/13/2018 07:46 AM
Updated: 02/21/2023 11:28 AM
Changes: 03/13/2018 07:46 AM (70), 01/12/2020 04:16 PM (4), 02/21/2023 11:28 AM (4)
Complete: 🔍
Cache ID: 18:F02:40

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