CVE-2021-4091 Use after free in 389-ds-base
High 7.5
Published
Updated
Check this codebase for CVE-2021-4091 and fix it if it is affected.
What it is: CVE-2021-4091 is a high-severity use after free vulnerability in Redhat Enterprise Linux Desktop, published on 18 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4091 in the wild and no public exploit code.
Affected product: Redhat Enterprise Linux Desktop. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-4091/ (Markdown: https://insights.sbomify.com/CVE-2021-4091/index.md)
An attacker can crash the 389-ds-base LDAP server by sending specific search requests that trigger a double-free error in virtual attribute handling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4091?
CVE-2021-4091 is a high-severity use after free vulnerability in Redhat Enterprise Linux Desktop, published on 18 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A double-free was found in the way 389-ds-base handles virtual attributes context in persistent searches. An attacker could send a series of search requests, forcing the server to behave unexpectedly, and crash.
Weakness: CWE-415
Which versions are affected by CVE-2021-4091?
It affects 8 products.
Linux distribution packages (40)
389-ds-base AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
389-ds-base-devel AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
389-ds-base-legacy-tools AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
389-ds-base-libs AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
389-ds-base-snmp AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
python3-lib389 AlmaLinux:8 | All versions | 1.4.3.23-14.module_el8.5.0+2628+c731dc97 |
389-ds-base Red Hat:enterprise_linux:7::client | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-devel Red Hat:enterprise_linux:7::client | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-libs Red Hat:enterprise_linux:7::client | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-snmp Red Hat:enterprise_linux:7::client | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-libs Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-snmp Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base Red Hat:enterprise_linux:7::server | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-devel Red Hat:enterprise_linux:7::server | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-libs Red Hat:enterprise_linux:7::server | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-snmp Red Hat:enterprise_linux:7::server | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-devel Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-libs Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base-snmp Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.10.2-15.el7_9 |
389-ds-base Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-devel Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-legacy-tools Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-legacy-tools-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-libs Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-libs-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-snmp Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base-snmp-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
python3-lib389 Red Hat:enterprise_linux:8::appstream | All versions | 0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 |
389-ds-base Red Hat:rhel_eus:8.4::appstream | All versions | 0:1.4.3.16-20.module+el8.4.0+14552+b182c759 |
389-ds-base-debuginfo Red Hat:rhel_eus:8.4::appstream | All versions | 0:1.4.3.16-20.module+el8.4.0+14552+b182c759 |
389-ds-base-debugsource Red Hat:rhel_eus:8.4::appstream | All versions | 0:1.4.3.16-20.module+el8.4.0+14552+b182c759 |
Products include Port389 389-Ds-Base, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux for Ibm Z Systems, Redhat Enterprise Linux for Power Big Endian, Redhat Enterprise Linux for Power Little Endian, Redhat Enterprise Linux for Scientific Computing and 2 more.
How do I fix CVE-2021-4091?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-4091 being exploited?
There is no known exploitation of CVE-2021-4091 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux Desktop
Sources
Also known as ALSA-2022:0889, DEBIAN-CVE-2021-4091, GHSA-qwhp-2gp7-qhfq, MGASA-2022-0106, RHSA-2022:0628, RHSA-2022:0889 and 3 more.