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CVE-2021-25321 arpwatch: Local privilege escalation from runtime user to root

High 7.8 Published Updated

Local attackers with runtime user control can escalate privileges to root via symlink following in arpwatch upon service restart.

Exploited in the wild
Not known
Login needed
Any signed-in user
Attackable
Local or same network only
Victim action needed
Not needed
Fix
Available

What is CVE-2021-25321?

CVE-2021-25321 is a high-severity vulnerability in SUSE Factory, published on 30 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A UNIX Symbolic Link (Symlink) Following vulnerability in arpwatch of SUSE Linux Enterprise Server 11-SP4-LTSS, SUSE Manager Server 4.0, SUSE OpenStack Cloud Crowbar 9; openSUSE Factory, Leap 15.2 allows local attackers with control of the runtime user to run arpwatch as to escalate to root upon the next restart of arpwatch. This issue affects: SUSE Linux Enterprise Server 11-SP4-LTSS arpwatch versions prior to 2.1a15. SUSE Manager Server 4.0 arpwatch versions prior to 2.1a15. SUSE OpenStack Cloud Crowbar 9 arpwatch versions prior to 2.1a15. openSUSE Factory arpwatch version 2.1a15-169.5 and prior versions. openSUSE Leap 15.2 arpwatch version 2.1a15-lp152.5.5 and prior versions.

Weakness: CWE-61

Which versions are affected by CVE-2021-25321?

It affects 1 product.

Linux distribution packages (34)
arpwatch SUSE:Enterprise Storage 6All versions2.1a15-5.12.1
arpwatch SUSE:HPE Helion OpenStack 8All versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise High Performance Computing 15-ESPOSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise High Performance Computing 15-LTSSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Module for Basesystem 15 SP2All versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Module for Basesystem 15 SP3All versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Point of Sale 11 SP3All versions2.1a15-131.23.2.6.1
arpwatch SUSE:Linux Enterprise Server 11 SP4-LTSSAll versions2.1a15-131.23.2.6.1
arpwatch SUSE:Linux Enterprise Server 12 SP2-BCLAll versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server 12 SP3-BCLAll versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server 12 SP3-LTSSAll versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server 12 SP4-LTSSAll versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server 12 SP5All versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server 15 SP1-BCLAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Server 15 SP1-LTSSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Server 15-LTSSAll versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Server for SAP Applications 12 SP3All versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server for SAP Applications 12 SP4All versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server for SAP Applications 12 SP5All versions2.1a15-159.9.1
arpwatch SUSE:Linux Enterprise Server for SAP Applications 15All versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Server for SAP Applications 15 SP1All versions2.1a15-5.12.1
arpwatch SUSE:Linux Enterprise Software Development Kit 12 SP5All versions2.1a15-159.9.1
arpwatch SUSE:Manager Proxy 4.0All versions2.1a15-5.12.1
arpwatch SUSE:Manager Retail Branch Server 4.0All versions2.1a15-5.12.1
arpwatch SUSE:Manager Server 4.0All versions2.1a15-5.12.1
arpwatch SUSE:OpenStack Cloud 8All versions2.1a15-159.9.1
arpwatch SUSE:OpenStack Cloud 9All versions2.1a15-159.9.1
arpwatch SUSE:OpenStack Cloud Crowbar 8All versions2.1a15-159.9.1
arpwatch SUSE:OpenStack Cloud Crowbar 9All versions2.1a15-159.9.1
arpwatch openSUSE:Leap 15.2All versions2.1a15-lp152.6.9.1
arpwatch openSUSE:Leap 15.3All versions2.1a15-5.12.1
arpwatch openSUSE:TumbleweedAll versions3.1-1.2

Products include Suse Arpwatch.

How do I fix CVE-2021-25321?

Apply the vendor's patch.

Is CVE-2021-25321 being exploited?

There is no known exploitation of CVE-2021-25321 in the wild and no public exploit code.

Sources

Also known as GHSA-p5jf-rf9m-p26h, MGASA-2021-0515, SUSE-SU-2021:14759-1, SUSE-SU-2021:2175-1, SUSE-SU-2021:2177-1, UBUNTU-CVE-2021-25321 and 3 more.

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