CVE-2023-50711 `serde` deserialization for `FamStructWrapper` lacks bound checks that could potentially lead to out-of-bounds memory access
Deserialization of FamStructWrapper lacks bound checks, allowing out-of-bounds memory access and potential code execution in Rust VMM components.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-50711?
CVE-2023-50711 is a medium-severity unsafe deserialization vulnerability in rust-vmm vmm-sys-util, published on 2 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2023-50711?
3 open source packages ship an affected version, including vmm-sys-util. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vmm-sys-util crates.io | From 0.5.0 | 0.12.0 |
vmm-sys-util crates.io | From 0.5.0 | 0.12.0 |
vmm-sys-util crates.io | From 0.5.0 | 0.12.0 |
Linux distribution packages (10)
aws-nitro-enclaves-cli SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | All versions | 1.3.0~git1.db34c02-150400.3.6.1 |
aws-nitro-enclaves-cli SUSE:Linux Enterprise Module for Public Cloud 15 SP5 | All versions | 1.3.0~git1.db34c02-150400.3.6.1 |
aws-nitro-enclaves-cli SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | All versions | 1.3.0~git1.db34c02-150600.10.3.1 |
sevctl SUSE:Linux Enterprise Module for Server Applications 15 SP5 | All versions | 0.4.3-150500.3.3.1 |
sevctl SUSE:Linux Micro 6.0 | All versions | 0.4.3-2.1 |
aws-nitro-enclaves-cli openSUSE:Leap 15.5 | All versions | 1.3.0~git1.db34c02-150400.3.6.1 |
sevctl openSUSE:Leap 15.5 | All versions | 0.4.3-150500.3.3.1 |
aws-nitro-enclaves-cli openSUSE:Leap 15.6 | All versions | 1.3.0~git1.db34c02-150600.10.3.1 |
sevctl openSUSE:Tumbleweed | All versions | 0.4.3-2.1 |
virtiofsd openSUSE:Tumbleweed | All versions | 1.10.1-1.1 |
Products include Rust-Vmm Vmm-Sys-Util.
How do I fix CVE-2023-50711?
Upgrade vmm-sys-util to 0.12.0 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2023-50711 being exploited?
There is no known exploitation of CVE-2023-50711 in the wild and no public exploit code.
Sources
Also known as AZL-32311, DEBIAN-CVE-2023-50711, GHSA-875g-mfp6-g7f9, RUSTSEC-2024-0002, SUSE-SU-2024:0250-1, SUSE-SU-2024:1966-1 and 6 more.