Upstream information

CVE-2021-23839 at MITRE

Description

OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x).

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 4.3
Vector AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database
Base Score 3.7
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Access Vector Network
Access Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact Low
Availability Impact None
CVSSv3 Version 3.1

Note from the SUSE Security Team

SUSE packages openssl-1_0_0 disable SSL2 by default, and so are not affected. Also openssl 1.1.x is not affected as it does not contain SSL2 support anymore, so openssl-1_1 packages are not affected. The issue was introduced in 2019, and not backported by us to older versions, so also older versions are not affected. Also older openssl versions disable SSL2 by default.

SUSE Bugzilla entry: 1182332 [RESOLVED / UPSTREAM]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
HPE Helion OpenStack 8 openssl Not affected
SUSE CaaS Platform 4.0 openssl Not affected
SUSE CaaS Platform 4.0 openssl-1_0_0 Not affected
SUSE CaaS Platform 4.0 openssl-1_1 Not affected
SUSE Enterprise Storage 6 openssl Not affected
SUSE Enterprise Storage 6 openssl-1_0_0 Not affected
SUSE Enterprise Storage 6 openssl-1_1 Not affected
SUSE Linux Enterprise High Performance Computing 12 SP5 openssl Not affected
SUSE Linux Enterprise High Performance Computing 12 SP5 openssl-1_0_0 Not affected
SUSE Linux Enterprise High Performance Computing 12 SP5 openssl-1_1 Not affected
SUSE Linux Enterprise High Performance Computing 15 LTSS openssl Not affected
SUSE Linux Enterprise High Performance Computing 15 LTSS openssl-1_1 Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS openssl Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS openssl-1_1 Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 openssl Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 openssl-1_1 Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 openssl In progress
SUSE Linux Enterprise Module for Basesystem 15 SP2 openssl-1_1 In progress
SUSE Linux Enterprise Module for Legacy 12 compat-openssl098 Not affected
SUSE Linux Enterprise Module for Legacy 15 SP1 openssl-1_0_0 Not affected
SUSE Linux Enterprise Module for Legacy 15 SP2 openssl-1_0_0 Not affected
SUSE Linux Enterprise Point of Service 11 SP3 openssl Not affected
SUSE Linux Enterprise Point of Service Image Server 12 SP2 openssl Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS openssl Not affected
SUSE Linux Enterprise Server 12 SP2 ESPOS openssl Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS openssl Not affected
SUSE Linux Enterprise Server 12 SP3 ESPOS openssl Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS openssl Not affected
SUSE Linux Enterprise Server 12 SP4 ESPOS openssl Not affected
SUSE Linux Enterprise Server 12 SP4 ESPOS openssl-1_0_0 Not affected
SUSE Linux Enterprise Server 12 SP4 ESPOS openssl-1_1 Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS openssl Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS openssl-1_0_0 Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS openssl-1_1 Not affected
SUSE Linux Enterprise Server 12 SP5 openssl Not affected
SUSE Linux Enterprise Server 12 SP5 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server 12 SP5 openssl-1_1 Not affected
SUSE Linux Enterprise Server 15 ESPOS openssl Not affected
SUSE Linux Enterprise Server 15 ESPOS openssl-1_1 Not affected
SUSE Linux Enterprise Server 15 LTSS openssl Not affected
SUSE Linux Enterprise Server 15 LTSS openssl-1_0_0 Not affected
SUSE Linux Enterprise Server 15 LTSS openssl-1_1 Not affected
SUSE Linux Enterprise Server 15 SP1 LTSS openssl Not affected
SUSE Linux Enterprise Server 15 SP1 LTSS openssl-1_0_0 Not affected
SUSE Linux Enterprise Server 15 SP1 LTSS openssl-1_1 Not affected
SUSE Linux Enterprise Server BCL 12 SP2 openssl Not affected
SUSE Linux Enterprise Server BCL 12 SP3 openssl Not affected
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 openssl Not affected
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 openssl-1_1 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 compat-openssl098 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 compat-openssl098 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 openssl-1_1 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 compat-openssl098 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 openssl-1_1 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 15 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 openssl-1_1 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 openssl Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 openssl-1_0_0 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 openssl-1_1 Not affected
SUSE Linux Enterprise Software Development Kit 12 SP5 openssl-1_1 Not affected
SUSE Manager Proxy 4.0 openssl Not affected
SUSE Manager Proxy 4.0 openssl-1_0_0 Not affected
SUSE Manager Proxy 4.0 openssl-1_1 Not affected
SUSE Manager Retail Branch Server 4.0 openssl Not affected
SUSE Manager Retail Branch Server 4.0 openssl-1_0_0 Not affected
SUSE Manager Retail Branch Server 4.0 openssl-1_1 Not affected
SUSE Manager Server 4.0 openssl Not affected
SUSE Manager Server 4.0 openssl-1_0_0 Not affected
SUSE Manager Server 4.0 openssl-1_1 Not affected
SUSE OpenStack Cloud 7 openssl Not affected
SUSE OpenStack Cloud 8 openssl Not affected
SUSE OpenStack Cloud 9 openssl Not affected
SUSE OpenStack Cloud 9 openssl-1_0_0 Not affected
SUSE OpenStack Cloud 9 openssl-1_1 Not affected
SUSE OpenStack Cloud Crowbar 8 openssl Not affected
SUSE OpenStack Cloud Crowbar 9 openssl Not affected
SUSE OpenStack Cloud Crowbar 9 openssl-1_0_0 Not affected
SUSE OpenStack Cloud Crowbar 9 openssl-1_1 Not affected
Security Module for SUSE Linux Enterprise 11 openssl1 Not affected