squashfs/sasquatch unsquash-4.c read_fragment_table_4 integer overflow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in squashfs and sasquatch. This affects the function read_fragment_table_4 of the file unsquash-4.c. The manipulation leads to integer overflow. This vulnerability is traded as CVE-2015-4645. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in squashfs and sasquatch (the affected version is unknown) and classified as critical. This issue affects the function read_fragment_table_4 of the file unsquash-4.c. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in the read_fragment_table_4 function in unsquash-4.c in Squashfs and sasquatch allows remote attackers to cause a denial of service (application crash) via a crafted input, which triggers a stack-based buffer overflow.

The bug was discovered 06/18/2015. The weakness was shared 03/17/2017 by Giancarlo Canales (Website). The advisory is shared at lists.fedoraproject.org. The identification of this vulnerability is CVE-2015-4645 since 06/18/2015. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 84841 (Fedora 22 : squashfs-tools-4.3-11.fc22 (2015-10750)), 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 124019 (Fedora Security Update for squashfs-tools (FEDORA-2015-10760)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (84841) and SecurityFocus (BID 75272†). The entry VDB-99782 is related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 84841
Nessus Name: Fedora 22 : squashfs-tools-4.3-11.fc22 (2015-10750)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 870079
OpenVAS Name: Fedora Update for squashfs-tools FEDORA-2015-10760
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/17/2015 🔍
06/18/2015 +1 days 🔍
06/18/2015 +0 days 🔍
06/26/2015 +8 days 🔍
07/20/2015 +24 days 🔍
03/17/2017 +606 days 🔍
03/17/2017 +0 days 🔍
03/18/2017 +1 days 🔍
09/09/2020 +1271 days 🔍

Sourcesinfo

Advisory: lists.fedoraproject.org
Researcher: Giancarlo Canales
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-4645 (🔍)
GCVE (CVE): GCVE-0-2015-4645
GCVE (VulDB): GCVE-100-98249
SecurityFocus: 75272 - Squashfs and sasquatch 'read_fragment_table_4' Multiple Stack Buffer Overflow Vulnerabilities
OSVDB: - CVE-2015-4645 - Squashfs, sasquatch - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 03/18/2017 02:57
Updated: 09/09/2020 17:06
Changes: 03/18/2017 02:57 (76), 09/09/2020 17:06 (3)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!