NSS up to 3.38 SSLv2 ClientHello 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in NSS up to 3.38. This impacts an unknown function of the component SSLv2 Handler. Performing a manipulation as part of ClientHello results in 7pk security. This vulnerability is reported as CVE-2018-12384. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in NSS up to 3.38. It has been classified as critical. This affects an unknown code of the component SSLv2 Handler. The manipulation as part of a ClientHello leads to a 7pk security vulnerability. CWE is classifying the issue as CWE-254. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.

The bug was discovered 09/03/2018. The weakness was disclosed 04/29/2019 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2018-12384 since 06/14/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1211 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 36 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118058 (Scientific Linux Security Update : nss on SL6.x i386/x86_64 (20181009)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Scientific Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171789 (SUSE Enterprise Linux Security Update for MozillaFirefox, mozilla-nspr and mozilla-nss (SUSE-SU-2018:4236-1)).

Upgrading to version 3.39 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 databases at Tenable (118058) and SecurityFocus (BID 107260†). The entry VDB-133513 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: 7pk security
CWE: CWE-254
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: 118058
Nessus Name: Scientific Linux Security Update : nss on SL6.x i386/x86_64 (20181009)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: NSS 3.39

Timelineinfo

06/14/2018 🔍
09/03/2018 +81 days 🔍
10/09/2018 +36 days 🔍
10/11/2018 +2 days 🔍
11/30/2018 +50 days 🔍
04/29/2019 +150 days 🔍
04/29/2019 +0 days 🔍
06/04/2020 +402 days 🔍

Sourcesinfo

Advisory: bugzilla.mozilla.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12384 (🔍)
GCVE (CVE): GCVE-0-2018-12384
GCVE (VulDB): GCVE-100-134187
SecurityFocus: 107260 - Mozilla Network Security Services CVE-2018-12404 Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 04/29/2019 21:39
Updated: 06/04/2020 16:14
Changes: 04/29/2019 21:39 (75), 06/04/2020 16:14 (4)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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