Dropbear up to 2017.74 TCP Listener double free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Dropbear up to 2017.74. Affected by this issue is some unknown functionality of the component TCP Listener. This manipulation causes double free. The identification of this vulnerability is CVE-2017-9078. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Dropbear up to 2017.74 (SSH Server Software). It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component TCP Listener. The manipulation with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners when the -a option is enabled.

The bug was discovered 05/18/2017. The weakness was shared 05/19/2017 (Website). The advisory is shared at lists.ucc.gu.uwa.edu.au. This vulnerability is known as CVE-2017-9078 since 05/19/2017. The attack can be launched remotely. A single authentication is required for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 100306 (Debian DSA-3859-1 : dropbear - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276686 (Fedora Security Update for dropbear (FEDORA-2017-8e9bd58cbb)).

Upgrading to version 2017.75 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (100306). The entry VDB-101510 is related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100306
Nessus Name: Debian DSA-3859-1 : dropbear - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703859
OpenVAS Name: Debian Security Advisory DSA 3859-1 (dropbear - 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: 🔍

Upgrade: Dropbear 2017.75

Timelineinfo

05/18/2017 🔍
05/19/2017 +1 days 🔍
05/19/2017 +0 days 🔍
05/19/2017 +0 days 🔍
05/19/2017 +0 days 🔍
05/19/2017 +0 days 🔍
05/22/2017 +3 days 🔍
09/30/2020 +1227 days 🔍

Sourcesinfo

Advisory: lists.ucc.gu.uwa.edu.au
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-9078 (🔍)
GCVE (CVE): GCVE-0-2017-9078
GCVE (VulDB): GCVE-100-101509

OVAL: 🔍

OSVDB: - CVE-2017-9078 - Dropbear - Double Free Issue

See also: 🔍

Entryinfo

Created: 05/19/2017 23:51
Updated: 09/30/2020 14:34
Changes: 05/19/2017 23:51 (73), 09/30/2020 14:34 (4)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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