Multiple vulnerabilities in nginx

1) NULL pointer dereference

EUVDB-ID: #VU56735

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-0742

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within resolver in nginx when processing UDP DNS packets. A remote attacker can send a specially crafted UDP DNS response to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nginx: 0.6.18 - 1.9.9

External links

http://lists.opensuse.org/opensuse-updates/2016-02/msg00042.html
http://mailman.nginx.org/pipermail/nginx/2016-January/049700.html
http://www.debian.org/security/2016/dsa-3473
http://www.securitytracker.com/id/1034869
http://www.ubuntu.com/usn/USN-2892-1
http://access.redhat.com/errata/RHSA-2016:1425
http://bto.bluecoat.com/security-advisory/sa115
http://bugzilla.redhat.com/show_bug.cgi?id=1302587
http://security.gentoo.org/glsa/201606-06

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU56736

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-0746

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing a crafted DNS response related to CNAME response processing within the resolver in nginx. A remote attacker can send a specially crafted DNS response to the affected server, trigger a use-after-free error and perform a denial of service attack or execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nginx: 0.6.18 - 1.9.9

External links

http://lists.opensuse.org/opensuse-updates/2016-02/msg00042.html
http://mailman.nginx.org/pipermail/nginx/2016-January/049700.html
http://www.debian.org/security/2016/dsa-3473
http://www.securitytracker.com/id/1034869
http://www.ubuntu.com/usn/USN-2892-1
http://access.redhat.com/errata/RHSA-2016:1425
http://bto.bluecoat.com/security-advisory/sa115
http://bugzilla.redhat.com/show_bug.cgi?id=1302588
http://security.gentoo.org/glsa/201606-06

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Resource exhaustion

EUVDB-ID: #VU56737

Risk: High

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-0747

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly limit the CNAME resolution within resolver component. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack by send a specially crafted DNS response.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

nginx: 0.6.18 - 1.9.9

External links

http://lists.opensuse.org/opensuse-updates/2016-02/msg00042.html
http://mailman.nginx.org/pipermail/nginx/2016-January/049700.html
http://www.debian.org/security/2016/dsa-3473
http://www.securitytracker.com/id/1034869
http://www.ubuntu.com/usn/USN-2892-1
http://access.redhat.com/errata/RHSA-2016:1425
http://bto.bluecoat.com/security-advisory/sa115
http://bugzilla.redhat.com/show_bug.cgi?id=1302589
http://security.gentoo.org/glsa/201606-06

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.