NSS 3.24.0 SSLv2 Message null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability classified as problematic has been found in NSS 3.24.0. This affects an unknown function of the component SSLv2 Message 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. The summary by CVE is:

Null pointer dereference vulnerability in NSS since 3.24.0 was found when server receives empty SSLv2 messages resulting into denial of service by remote attacker.

The bug was discovered 01/03/2017. The weakness was released 05/30/2017 (Website). It is possible to read the advisory at hg.mozilla.org. This vulnerability is uniquely identified as CVE-2017-7502. 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 vulnerability was handled as a non-public zero-day exploit for at least 147 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101001 (Amazon Linux AMI : nss (ALAS-2017-848)), which helps to determine the existence of the flaw in a target environment. It is running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176051 (Debian Security Update for nss (DSA 3872-1)).

It is possible to mitigate the weakness by firewalling . A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101001), SecurityFocus (BID 98744†) and SecurityTracker (ID 1038579†).




CPE 2.3info

CPE 2.2info


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

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
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NVD Base Score: 7.5
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 101001
Nessus Name: Amazon Linux AMI : nss (ALAS-2017-848)
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OpenVAS ID: 703872
OpenVAS Name: Debian Security Advisory DSA 3872-1 (nss - security update)
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Threat Intelligenceinfo

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Recommended: Firewall
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04/05/2017 🔍
01/03/2017 +16935 days 🔍
04/28/2017 +115 days 🔍
05/30/2017 +32 days 🔍
05/30/2017 +0 days 🔍
05/30/2017 +0 days 🔍
05/31/2017 +1 days 🔍
06/22/2017 +22 days 🔍
06/23/2017 +1 days 🔍
12/07/2022 +1993 days 🔍


Advisory: RHSA-2017:1364
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7502 (🔍)

SecurityFocus: 98744 - Mozilla Network Security Services CVE-2017-7502 Denial of Service Vulnerability
OSVDB: - CVE-2017-7502 - Mozilla - Network Security Services - Denial of Service Issue
SecurityTracker: 1038579


Created: 05/31/2017 08:15 AM
Updated: 12/07/2022 02:14 PM
Changes: 05/31/2017 08:15 AM (85), 12/07/2022 02:14 PM (4)
Complete: 🔍
Cache ID: 44:34C:40


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