Bug 1218690 (CVE-2023-6129)

Summary:	VUL-0: CVE-2023-6129: openssl-3: POLY1305 MAC implementation corrupts vector registers on PowerPC
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	abergmann, meissner, pmonrealgonzalez, stoyan.manolov
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/390487/
Whiteboard:	CVSSv3.1:SUSE:CVE-2023-6129:6.5:(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-01-10 09:46:19 UTC

CVE-2023-6129

Issue summary: The POLY1305 MAC (message authentication code) implementation contains a bug that might corrupt the internal state of applications running on PowerPC CPU based platforms if the CPU provides vector instructions.

Impact summary: If an attacker can influence whether the POLY1305 MAC algorithm is used, the application state might be corrupted with various application dependent consequences.

The POLY1305 MAC (message authentication code) implementation in OpenSSL for PowerPC CPUs restores the contents of vector registers in a different order than they are saved. Thus the contents of some of these vector registers are corrupted when returning to the caller. The vulnerable code is used only on newer PowerPC processors supporting the PowerISA 2.07 instructions.

The consequences of this kind of internal application state corruption can be various - from no consequences, if the calling application does not depend on the contents of non-volatile XMM registers at all, to the worst consequences, where the attacker could get complete control of the application process. However unless the compiler uses the vector registers for storing pointers, the most likely consequence, if any, would be an incorrect result of some application dependent calculations or a crash leading to a denial of service.

The POLY1305 MAC algorithm is most frequently used as part of the
CHACHA20-POLY1305 AEAD (authenticated encryption with associated data) algorithm. The most common usage of this AEAD cipher is with TLS protocol versions 1.2 and 1.3. If this cipher is enabled on the server a malicious client can influence whether this AEAD cipher is used. This implies that TLS server applications using OpenSSL can be potentially impacted. However we are currently not aware of any concrete application that would be affected by this issue therefore we consider this a Low severity security issue. 

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-6129
https://seclists.org/oss-sec/2024/q1/15
https://github.com/openssl/openssl/commit/050d26383d4e264966fb83428e72d5d48f402d35
https://github.com/openssl/openssl/commit/5b139f95c9a47a55a0c54100f3837b1eee942b04
https://github.com/openssl/openssl/commit/f3fc5808fe9ff74042d639839610d03b8fdcc015
https://www.openssl.org/news/secadv/20240109.txt
https://www.cve.org/CVERecord?id=CVE-2023-6129
http://www.openwall.com/lists/oss-security/2024/01/09/1
https://bugzilla.redhat.com/show_bug.cgi?id=2257571

Comment 1 Alexander Bergmann 2024-01-10 09:47:24 UTC

This affects openssl-3 only.

Comment 2 Pedro Monreal Gonzalez 2024-01-10 11:33:36 UTC

I'm assigning the bug to Otto.

From the advisory: "... The fix is also available in commit 5b139f95 (for 3.2), commit f3fc5808 (for 3.1) and commit 050d263 (for 3.0) in the OpenSSL git repository."

Comment 3 Pedro Monreal Gonzalez 2024-01-10 11:34:49 UTC

(In reply to Pedro Monreal Gonzalez from comment #2)
> I'm assigning the bug to Otto.
> 
> From the advisory: "... The fix is also available in commit 5b139f95 (for
> 3.2), commit f3fc5808 (for 3.1) and commit 050d263 (for 3.0) in the OpenSSL
> git repository."

Well, the patch is the exactly same in those commits.

Comment 5 Otto Hollmann 2024-01-12 09:38:55 UTC

SLE submissions are mentioned in comment #4, Factory is submitted here:
> https://build.opensuse.org/request/show/1138252

This issue affected only OpenSSL v3 so no other codestreams are affected.

Assigning back to security-team.

Comment 7 OBSbugzilla Bot 2024-01-17 11:35:04 UTC

This is an autogenerated message for OBS integration:
This bug (1218690) was mentioned in
https://build.opensuse.org/request/show/1139418 Factory / openssl-3

Comment 9 OBSbugzilla Bot 2024-01-18 17:35:04 UTC

This is an autogenerated message for OBS integration:
This bug (1218690) was mentioned in
https://build.opensuse.org/request/show/1139767 Factory / openssl-3

Comment 10 Maintenance Automation 2024-01-22 20:30:02 UTC

SUSE-SU-2024:0172-1: An update that solves two vulnerabilities can now be installed.

Category: security (moderate)
Bug References: 1218690, 1218810
CVE References: CVE-2023-6129, CVE-2023-6237
Sources used:
openSUSE Leap 15.5 (src): openssl-3-3.0.8-150500.5.24.1
Basesystem Module 15-SP5 (src): openssl-3-3.0.8-150500.5.24.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 15 Maintenance Automation 2024-02-15 20:30:07 UTC

SUSE-SU-2024:0518-1: An update that solves three vulnerabilities can now be installed.

Category: security (moderate)
Bug References: 1218690, 1218810, 1219243
CVE References: CVE-2023-6129, CVE-2023-6237, CVE-2024-0727
Sources used:
SUSE Linux Enterprise Desktop 15 SP4 LTSS 15-SP4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Server 15 SP4 LTSS 15-SP4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Server for SAP Applications 15 SP4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Manager Proxy 4.3 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Manager Retail Branch Server 4.3 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Manager Server 4.3 (src): openssl-3-3.0.8-150400.4.49.1
openSUSE Leap 15.4 (src): openssl-3-3.0.8-150400.4.49.1
openSUSE Leap Micro 5.3 (src): openssl-3-3.0.8-150400.4.49.1
openSUSE Leap Micro 5.4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Micro for Rancher 5.3 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Micro 5.3 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Micro for Rancher 5.4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise Micro 5.4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (src): openssl-3-3.0.8-150400.4.49.1
SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (src): openssl-3-3.0.8-150400.4.49.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.