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hackeroneNimiaH1:166634
HistorySep 07, 2016 - 5:41 p.m.

Internet Bug Bounty: SSLv2 doesn't block disabled ciphers (CVE-2015-3197)

2016-09-0717:41:26
nimia
hackerone.com
27

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

0.007 Low

EPSS

Percentile

78.3%

This is a DROWN-related issue that essentially circumvented the instructions on how to disable SSLv2 at the time. Its primary effect was that a lot of servers were vulnerable to DROWN even though they thought they had SSLv2 disabled.
It was reported to OpenSSL and fixed in versions 1.0.2f and 1.0.1r:
https://www.openssl.org/news/secadv/20160128.txt

(and obviously the DROWN attack itself was reported to OpenSSL, as explained in this OpenSSL blogpost:
https://www.openssl.org/blog/blog/2016/03/01/an-openssl-users-guide-to-drown/

Thanks!

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

0.007 Low

EPSS

Percentile

78.3%