Bug 1218499 (CVE-2023-50711)

Summary:	VUL-0: CVE-2023-50711: TRACKERBUG: vmm-sys-util: out of bounds memory accesses
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	IN_PROGRESS ---	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	thomas.leroy
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/389863/
Whiteboard:	CVSSv3.1:SUSE:CVE-2023-50711:5.7:(AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---
Bug Depends on:	1218502, 1218500, 1218501
Bug Blocks:

Description SMASH SMASH 2024-01-03 10:18:14 UTC

vmm-sys-util is a collection of modules that provides helpers and utilities used by multiple rust-vmm components. Starting in version 0.5.0 and prior to version 0.12.0, an issue in the `FamStructWrapper::deserialize` implementation provided by the crate for `vmm_sys_util::fam::FamStructWrapper` can lead to out of bounds memory accesses. The deserialization does not check that the length stored in the header matches the flexible array length. Mismatch in the lengths might allow out of bounds memory access through Rust-safe methods. The issue was corrected in version 0.12.0 by inserting a check that verifies the lengths of compared flexible arrays are equal for any deserialized header and aborting deserialization otherwise. Moreover, the API was changed so that header length can only be modified through Rust-unsafe code. This ensures that users cannot trigger out-of-bounds memory access from Rust-safe code.

References:
https://github.com/rust-vmm/vmm-sys-util/security/advisories/GHSA-875g-mfp6-g7f9
https://github.com/rust-vmm/vmm-sys-util/commit/30172fca2a8e0a38667d934ee56682247e13f167
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-50711

Comment 1 Thomas Leroy 2024-01-03 10:19:52 UTC

vmm-sys-util crate is embedded in the following:

- SUSE:ALP:Source:Standard:1.0/virtiofsd,1,vmm-sys-util,0.11.1
- SUSE:SLE-15-SP4:Update/aws-nitro-enclaves-cli,1,vmm-sys-util,0.8.0
- SUSE:SLE-15-SP5:Update/sevctl,1,vmm-sys-util,0.11.0
- openSUSE:Factory/aws-nitro-enclaves-cli,5,vmm-sys-util,0.8.0
- openSUSE:Factory/firecracker,9,vmm-sys-util,0.11.0
- openSUSE:Factory/libkrun,10,vmm-sys-util,0.11.1
- openSUSE:Factory/sevctl,6,vmm-sys-util,0.11.1
- openSUSE:Factory/virtiofsd,3,vmm-sys-util,0.11.1

All of the above packages embed an affected version.

Comment 3 OBSbugzilla Bot 2024-01-24 17:35:03 UTC

This is an autogenerated message for OBS integration:
This bug (1218499) was mentioned in
https://build.opensuse.org/request/show/1141311 Factory / sevctl

Comment 4 Maintenance Automation 2024-01-26 16:30:11 UTC

SUSE-SU-2024:0250-1: An update that solves one vulnerability, contains one feature and has one security fix can now be installed.

Category: security (important)
Bug References: 1218499, 1218502
CVE References: CVE-2023-50711
Jira References: PED-4981
Sources used:
openSUSE Leap 15.5 (src): sevctl-0.4.3-150500.3.3.1
Server Applications Module 15-SP5 (src): sevctl-0.4.3-150500.3.3.1

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.