National Vulnerability Database

National Vulnerability Database

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    Vulnerabilities Detail

CVE-2019-1559 Detail

Current Description

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

Source:  MITRE
Description Last Modified:  02/27/2019
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 5.9 MEDIUM
Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N (V3 legend)
Impact Score: 3.6
Exploitability Score: 2.2

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 4.3 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6

Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): None
Availability (A): None
Additional Information:
Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/107174 Third Party Advisory VDB Entry
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00003.html Mailing List Third Party Advisory
https://security.gentoo.org/glsa/201903-10 Third Party Advisory
https://security.netapp.com/advisory/ntap-20190301-0001/ Patch Third Party Advisory
https://security.netapp.com/advisory/ntap-20190301-0002/ Third Party Advisory
https://usn.ubuntu.com/3899-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4400 Third Party Advisory
https://www.openssl.org/news/secadv/20190226.txt Vendor Advisory

Technical Details

Vulnerability Type (View All)

  • Information Leak / Disclosure (CWE-200)

Change History

11 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-1559
NVD Published Date:
02/27/2019
NVD Last Modified:
03/18/2019