BusyBox 1.27.2 decompress_bunzip2.c get_next_block integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in BusyBox 1.27.2. This impacts the function get_next_block in the library archival/libarchive/decompress_bunzip2.c. The manipulation results in integer overflow. This vulnerability is reported as CVE-2017-15873. The attack requires a local approach. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in BusyBox 1.27.2. Affected is the function get_next_block in the library archival/libarchive/decompress_bunzip2.c. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The get_next_block function in archival/libarchive/decompress_bunzip2.c in BusyBox 1.27.2 has an Integer Overflow that may lead to a write access violation.

The bug was discovered 10/22/2017. The weakness was disclosed 10/24/2017 by Matt (Website). The advisory is shared for download at bugs.busybox.net. This vulnerability is traded as CVE-2017-15873 since 10/24/2017. 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 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108627 (GLSA-201803-12 : BusyBox: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197418 (Ubuntu Security Notification for Busybox Vulnerabilities (USN-3935-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108627), EUVD (EUVD-2017-7295) and SecurityFocus (BID 72324†). The entries VDB-96755, VDB-96756, VDB-97860 and VDB-104922 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

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

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108627
Nessus Name: GLSA-201803-12 : BusyBox: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.busybox.net

Timelineinfo

01/27/2015 🔍
10/22/2017 +999 days 🔍
10/24/2017 +2 days 🔍
10/24/2017 +0 days 🔍
10/24/2017 +0 days 🔍
10/25/2017 +1 days 🔍
03/26/2018 +152 days 🔍
03/27/2018 +1 days 🔍
06/09/2025 +2631 days 🔍

Sourcesinfo

Advisory: USN-3935-1
Researcher: Matthias Krause (Matt)
Status: Confirmed

CVE: CVE-2017-15873 (🔍)
GCVE (CVE): GCVE-0-2017-15873
GCVE (VulDB): GCVE-100-108612
EUVD: 🔍
SecurityFocus: 72324 - BusyBox CVE-2014-9645 Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 10/25/2017 09:19
Updated: 06/09/2025 19:00
Changes: 10/25/2017 09:19 (66), 11/30/2019 16:09 (13), 01/20/2021 16:52 (2), 01/04/2023 14:33 (4), 06/09/2025 18:52 (15), 06/09/2025 19:00 (1)
Complete: 🔍
Cache ID: 216::103

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