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 remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - Mozilla NSS: Errors in mp_div and mp_exptmod cryptographic functions (CVE-2016-1938)

  - SSL/TLS: Birthday attack against 64-bit block ciphers (SWEET32) (CVE-2016-2183)

  - The SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer,     Mozilla Firefox, Google Chrome, Opera, and other products, encrypts data by using CBC mode with chained     initialization vectors, which allows man-in-the-middle attackers to obtain plaintext HTTP headers via a     blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses     (1) the HTML5 WebSocket API, (2) the Java URLConnection API, or (3) the Silverlight WebClient API, aka a     BEAST attack. (CVE-2011-3389)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote NewStart CGSL host, running version MAIN 4.05, has nss packages installed that are affected by multiple vulnerabilities:

  - An out-of-bounds write flaw was found in the way NSS     performed certain Base64-decoding operations. An     attacker could use this flaw to create a specially     crafted certificate which, when parsed by NSS, could     cause it to crash or execute arbitrary code, using the     permissions of the user running an application compiled     against the NSS library. (CVE-2017-5461)

  - A null pointer dereference flaw was found in the way NSS     handled empty SSLv2 messages. An attacker could use this     flaw to crash a server application compiled against the     NSS library. (CVE-2017-7502)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update for nss is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

Security Fix(es) :

* A NULL pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library. (CVE-2017-7502)

Bug Fix(es) :

* The Network Security Services (NSS) code and Certificate Authority (CA) list have been updated to meet the recommendations as published with the latest Mozilla Firefox Extended Support Release (ESR). The updated CA list improves compatibility with the certificates that are used in the Internet Public Key Infrastructure (PKI). To avoid certificate validation refusals, Red Hat recommends installing the updated CA list on June 12, 2017. (BZ# 1451421)

Note that Tenable Network Security has attempted to extract the preceding description block directly from the corresponding Red Hat security advisory. Virtuozzo provides no description for VZLSA advisories. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for nss is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

Security Fix(es) :

* A NULL pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library. (CVE-2017-7502)

Bug Fix(es) :

* The Network Security Services (NSS) code and Certificate Authority (CA) list have been updated to meet the recommendations as published with the latest Mozilla Firefox Extended Support Release (ESR). The updated CA list improves compatibility with the certificates that are used in the Internet Public Key Infrastructure (PKI). To avoid certificate validation refusals, Red Hat recommends installing the updated CA list on June 12, 2017. (BZ# 1448488)

Note that Tenable Network Security has attempted to extract the preceding description block directly from the corresponding Red Hat security advisory. Virtuozzo provides no description for VZLSA advisories. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

NULL pointer dereference when handling empty SSLv2 messages :

A NULL pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library. (CVE-2017-7502)

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3336-1 advisory.

    It was discovered that NSS incorrectly handled certain empty SSLv2 messages. A remote attacker could     possibly use this issue to cause NSS to crash, resulting in a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the version of the nss packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A null pointer dereference flaw was found in the way     NSS handled empty SSLv2 messages. An attacker could use     this flaw to crash a server application compiled     against the NSS library. (CVE-2017-7502)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in NSS, a set of cryptographic libraries, which may result in denial of service or information disclosure.

CVE-2017-7502

A NULL pointer dereference vulnerability in NSS was found when server receives empty SSLv2 messages. This issue was introduced with the recent removal of SSLv2 protocol from upstream code in 3.24.0 and introduction of dedicated parser able to handle just sslv2-style hello messages.

For Debian 7 'Wheezy', this problem has been fixed in version 2:3.26-1+debu7u4.

We recommend that you upgrade your nss packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for nss is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

Security Fix(es) :

* A NULL pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library. (CVE-2017-7502)

Bug Fix(es) :

* The Network Security Services (NSS) code and Certificate Authority (CA) list have been updated to meet the recommendations as published with the latest Mozilla Firefox Extended Support Release (ESR). The updated CA list improves compatibility with the certificates that are used in the Internet Public Key Infrastructure (PKI). To avoid certificate validation refusals, Red Hat recommends installing the updated CA list on June 12, 2017. (BZ# 1451421)

An update for nss is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

Security Fix(es) :

* A NULL pointer dereference flaw was found in the way NSS handled empty SSLv2 messages. An attacker could use this flaw to crash a server application compiled against the NSS library. (CVE-2017-7502)

Bug Fix(es) :

* The Network Security Services (NSS) code and Certificate Authority (CA) list have been updated to meet the recommendations as published with the latest Mozilla Firefox Extended Support Release (ESR). The updated CA list improves compatibility with the certificates that are used in the Internet Public Key Infrastructure (PKI). To avoid certificate validation refusals, Red Hat recommends installing the updated CA list on June 12, 2017. (BZ# 1448488)

Security Fix(es) :

  - A NULL pointer dereference flaw was found in the way NSS     handled empty SSLv2 messages. An attacker could use this     flaw to crash a server application compiled against the     NSS library. (CVE-2017-7502)

Bug Fix(es) :

  - The Network Security Services (NSS) code and Certificate     Authority (CA) list have been updated to meet the     recommendations as published with the latest Mozilla     Firefox Extended Support Release (ESR). The updated CA     list improves compatibility with the certificates that     are used in the Internet Public Key Infrastructure     (PKI). To avoid certificate validation refusals,     consider installing the updated CA list on June 12,     2017.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2017-1365 advisory.

    [3.28.4-1.2.0.1]
    - Added nss-vendor.patch to change vendor

    [3.28.4-1.2]
    - Include CKBI 2.14 and updated CA constraints from NSS 3.28.5

    [3.28.4-1.1]
    - Fix zero-length record treatment in SSL3_GatherData

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2017-1364 advisory.

    [3.28.4-3.0.1]
    - Added nss-vendor.patch to change vendor
    - Temporarily disable some tests until expired PayPalEE.cert is renewed

    [3.28.4-3]
    - Fix zero-length record treatment for stream ciphers and SSLv2

    [3.28.4-2]
    - Include CKBI 2.14 and updated CA constraints from NSS 3.28.5

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
199394	RHEL 5 : nss (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
127337	NewStart CGSL MAIN 4.05 : nss Multiple Vulnerabilities (NS-SA-2019-0105)	Nessus	NewStart CGSL Local Security Checks	critical
101476	Virtuozzo 7 : nss / nss-devel / nss-pkcs11-devel / nss-sysinit / etc (VZLSA-2017-1365)	Nessus	Virtuozzo Local Security Checks	high
101475	Virtuozzo 6 : nss / nss-devel / nss-pkcs11-devel / nss-sysinit / etc (VZLSA-2017-1364)	Nessus	Virtuozzo Local Security Checks	high
101001	Amazon Linux AMI : nss (ALAS-2017-848)	Nessus	Amazon Linux Local Security Checks	high
100988	Ubuntu 14.04 LTS / 16.04 LTS : NSS vulnerability (USN-3336-1)	Nessus	Ubuntu Local Security Checks	high
100702	EulerOS 2.0 SP2 : nss (EulerOS-SA-2017-1109)	Nessus	Huawei Local Security Checks	high
100701	EulerOS 2.0 SP1 : nss (EulerOS-SA-2017-1108)	Nessus	Huawei Local Security Checks	high
100580	Debian DSA-3872-1 : nss - security update	Nessus	Debian Local Security Checks	critical
100559	Debian DLA-971-1 : nss security update	Nessus	Debian Local Security Checks	high
100556	CentOS 7 : nss (CESA-2017:1365)	Nessus	CentOS Local Security Checks	high
100555	CentOS 6 : nss (CESA-2017:1364)	Nessus	CentOS Local Security Checks	high
100536	Scientific Linux Security Update : nss on SL7.x x86_64 (20170530)	Nessus	Scientific Linux Local Security Checks	high
100535	Scientific Linux Security Update : nss on SL6.x i386/x86_64 (20170530)	Nessus	Scientific Linux Local Security Checks	high
100532	RHEL 7 : nss (RHSA-2017:1365)	Nessus	Red Hat Local Security Checks	high
100531	RHEL 6 : nss (RHSA-2017:1364)	Nessus	Red Hat Local Security Checks	high
100526	Oracle Linux 7 : nss (ELSA-2017-1365)	Nessus	Oracle Linux Local Security Checks	high
100525	Oracle Linux 6 : nss (ELSA-2017-1364)	Nessus	Oracle Linux Local Security Checks	high

Detections

Analytics

CVE-2017-7502

high

Tenable Plugins

high

critical

high

high

high

high

high

high

critical

high

high

high

high

high

high

high

high

high