libssh up to 0.6.4 Packet package_cb.c null pointer dereference

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7.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in libssh up to 0.6.4. The affected element is an unknown function of the file package_cb.c of the component Packet Handler. The manipulation results in null pointer dereference. This vulnerability was named CVE-2015-3146. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in libssh up to 0.6.4. Affected is some unknown functionality of the file package_cb.c of the component Packet Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

The (1) SSH_MSG_NEWKEYS and (2) SSH_MSG_KEXDH_REPLY packet handlers in package_cb.c in libssh before 0.6.5 do not properly validate state, which allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted SSH packet.

The weakness was presented 04/13/2016 (Website). The advisory is shared for download at debian.org. This vulnerability is traded as CVE-2015-3146 since 04/10/2015. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 84750 (Fedora 22 : libssh-0.7.1-1.fc22 (2015-10962)), 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 175641 (Debian Security Update for libssh (DSA 3488-1)).

Upgrading to version 0.6.5 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (84750). See VDB-73428 and VDB-82322 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

libssh

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 84750
Nessus Name: Fedora 22 : libssh-0.7.1-1.fc22 (2015-10962)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for libssh FEDORA-2015-7590
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libssh 0.6.5
Patch: git.libssh.org

Timelineinfo

04/10/2015 🔍
06/30/2015 +81 days 🔍
07/15/2015 +15 days 🔍
04/13/2016 +273 days 🔍
04/13/2016 +0 days 🔍
04/14/2016 +1 days 🔍
07/24/2022 +2292 days 🔍

Sourcesinfo

Advisory: USN-2912-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-3146 (🔍)
GCVE (CVE): GCVE-0-2015-3146
GCVE (VulDB): GCVE-100-82308
See also: 🔍

Entryinfo

Created: 04/14/2016 09:55
Updated: 07/24/2022 09:21
Changes: 04/14/2016 09:55 (50), 10/05/2018 07:51 (23), 07/24/2022 09:21 (5)
Complete: 🔍
Cache ID: 216::103