Matt Johnston Dropbear SSH Server up to 0.36 packet.c buf_decompress numeric error

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Matt Johnston Dropbear SSH Server up to 0.36. This vulnerability affects the function buf_decompress of the file packet.c. Such manipulation leads to numeric error. This vulnerability is traded as CVE-2013-4421. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Matt Johnston Dropbear SSH Server up to 0.36 (SSH Server Software) and classified as problematic. Affected by this issue is the function buf_decompress of the file packet.c. The manipulation with an unknown input leads to a numeric error vulnerability. Using CWE to declare the problem leads to CWE-189. Impacted is availability. CVE summarizes:

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

The weakness was shared 10/25/2013 (Website). The advisory is available at secure.ucc.asn.au. This vulnerability is handled as CVE-2013-4421 since 06/12/2013. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 70507 (Fedora 19 : dropbear-2013.59-1.fc19 (2013-18593)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 166334 (OpenSuSE Security Update for dropbear (openSUSE-SU-2013:1696-1)).

Upgrading to version 0.37 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (87848), Tenable (70507), SecurityFocus (BID 62958†), Secunia (SA55173†) and Vulnerability Center (SBV-42039†). The entries VDB-65355 and VDB-81407 are related to this item. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• SSH Server Software

Vendor

• Matt Johnston

Name

• Dropbear SSH Server

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

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

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Numeric error
CWE: CWE-189
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: 70507
Nessus Name: Fedora 19 : dropbear-2013.59-1.fc19 (2013-18593)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 866999
OpenVAS Name: Fedora Update for dropbear FEDORA-2013-18593
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dropbear SSH Server 0.37

Timelineinfo

06/12/2013 🔍
10/10/2013 +120 days 🔍
10/11/2013 +1 days 🔍
10/20/2013 +9 days 🔍
10/22/2013 +2 days 🔍
10/25/2013 +3 days 🔍
10/25/2013 +0 days 🔍
03/24/2015 +515 days 🔍
01/08/2022 +2482 days 🔍

Sourcesinfo

Advisory: secure.ucc.asn.au
Status: Not defined
Confirmation: 🔍

CVE: CVE-2013-4421 (🔍)
GCVE (CVE): GCVE-0-2013-4421
GCVE (VulDB): GCVE-100-65354
X-Force: 87848
SecurityFocus: 62958
Secunia: 55173 - Dropbear SSH Server User Enumeration Weakness and Denial of Service Vulnerability, Moderately Critical
Vulnerability Center: 42039 - Dropbear <2013.59 Remote DoS Vulnerability by Decompressing Payloads, Medium

See also: 🔍

Entryinfo

Created: 03/24/2015 15:54
Updated: 01/08/2022 22:13
Changes: 03/24/2015 15:54 (72), 05/14/2017 09:07 (4), 01/08/2022 22:13 (3)
Complete: 🔍
Cache ID: 216:3A0:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

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