OpenSSL up to 1.0.1r/1.0.2f SSLv2 DROWN cryptographic issues

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5.3$0-$5k0.00

A vulnerability was found in OpenSSL up to 1.0.1r/1.0.2f (Network Encryption Software). It has been declared as critical. Affected by this vulnerability is an unknown part of the component SSLv2 Handler. The manipulation with an unknown input leads to a weak encryption vulnerability (DROWN). The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 03/01/2016 by Nimrod Aviram and Sebastian Schinzel as 20160301.txt as confirmed advisory (Website). The advisory is shared at openssl.org. The public release was coordinated in cooperation with the project team. This vulnerability is known as CVE-2016-0800 since 12/16/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1600 for this issue. The advisory points out:

cross-protocol attack was discovered that could lead to decryption of TLS sessions by using a server supporting SSLv2 and EXPORT cipher suites as a Bleichenbacher RSA padding oracle. Note that traffic between clients and non-vulnerable servers can be decrypted provided another server supporting SSLv2 and EXPORT ciphers (even with a different protocol such as SMTP, IMAP or POP) shares the RSA keys of the non-vulnerable server. This vulnerability is known as DROWN (CVE-2016-0800).

After immediately, there has been an exploit disclosed. It is declared as proof-of-concept. It is possible to download the exploit at drownattack.com. The vulnerability was handled as a non-public zero-day exploit for at least 63 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 89082 (OpenSSL 1.0.2 < 1.0.2g Multiple Vulnerabilities (DROWN)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context remote. The commercial vulnerability scanner Qualys is able to test this issue with plugin 168833 (OpenSuSE Security Update for libopenssl0_9_8 (openSUSE-SU-2016:1241-1)). The advisory illustrates:

Recovering one session key requires the attacker to perform approximately 2^50 computation, as well as thousands of connections to the affected server. A more efficient variant of the DROWN attack exists against unpatched OpenSSL servers using versions that predate 1.0.2a, 1.0.1m, 1.0.0r and 0.9.8zf released on 19/Mar/2015 (see CVE-2016-0703 below).

Upgrading to version 1.0.1s or 1.0.2g eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Users can avoid this issue by disabling the SSLv2 protocol in all their SSL/TLS servers, if they've not done so already. Disabling all SSLv2 ciphers is also sufficient, provided the patches for CVE-2015-3197 (fixed in OpenSSL 1.0.1r and 1.0.2f) have been deployed. Servers that have not disabled the SSLv2 protocol, and are not patched for CVE-2015-3197 are vulnerable to DROWN even if all SSLv2 ciphers are nominally disabled, because malicious clients can force the use of SSLv2 with EXPORT ciphers.

The vulnerability is also documented in the databases at SecurityFocus (BID 83733), X-Force (111139), SecurityTracker (ID 1035133), Vulnerability Center (SBV-57345) and Tenable (89082). Additional details are provided at access.redhat.com. See 81112, 81142, 81143 and 81144 for similar entries.

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VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
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NVD Base Score: 5.9
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Exploitinginfoedit

Name: DROWN
Class: Weak encryption / DROWN
CWE: CWE-310
ATT&CK: T1600

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 89082
Nessus Name: OpenSSL 1.0.2 < 1.0.2g Multiple Vulnerabilities (DROWN)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-682
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Countermeasuresinfoedit

Recommended: Upgrade
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0-Day Time: 🔍
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Upgrade: OpenSSL 1.0.1s/1.0.2g
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Timelineinfoedit

12/16/2015 🔍
12/29/2015 +13 days 🔍
03/01/2016 +63 days 🔍
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03/01/2016 +0 days 🔍
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03/02/2016 +1 days 🔍
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03/02/2016 +0 days 🔍
03/16/2016 +14 days 🔍
01/08/2019 +1028 days 🔍
02/01/2019 +24 days 🔍

Sourcesinfoedit

Product: https://www.openssl.org/

Advisory: 20160301.txt
Researcher: Nimrod Aviram/Sebastian Schinzel
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-0800 (🔍)
OVAL: 🔍

SecurityFocus: 83733 - OpenSSL DROWN Attack CVE-2016-0800 Security Bypass Vulnerability
X-Force: 111139 - OpenSSL TLS security bypass
SecurityTracker: 1035133
Vulnerability Center: 57345 - OpenSSL Remote Security Bypass via TLS Chipertext Data Decryption - CVE-2016-0800, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
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Entryinfoedit

Created: 03/02/2016 01:52 PM
Updated: 02/01/2019 02:35 PM
Changes: (16) vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_confirm_url source_oval_id source_securityfocus_date source_securityfocus_class source_openvas_id source_openvas_filename source_openvas_title source_openvas_family
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