CVE-2020-25039 Insecure permissions on user namespace / fakeroot temporary rootfs in Singularity

What is CVE-2020-25039?

CVE-2020-25039 is a high-severity vulnerability in Opensuse Leap, published on 16 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Sylabs Singularity 3.2.0 through 3.6.2 has Insecure Permissions on temporary directories used in fakeroot or user namespace container execution.

Weakness: CWE-668

Which versions are affected by CVE-2020-25039?

2 open source packages ship an affected version, including github.com/sylabs/singularity. It affects 2 products.

Products include Opensuse Leap, Sylabs Singularity.

How do I fix CVE-2020-25039?

Upgrade github.com/sylabs/singularity to 3.6.3 or later.

Is CVE-2020-25039 being exploited?

There is no known exploitation of CVE-2020-25039 in the wild and no public exploit code.

Other vulnerabilities in Opensuse Leap

• CVE-2015-4902 Oracle Java SE Integrity Check Exploited Medium 5.3
• CVE-2017-14804 package builds could use directory traversal to write outside of target area Critical 9.9
• CVE-2019-20787 Teeworlds before 0.7.4 has an integer overflow when computing a tilemap size. Critical 9.8
• CVE-2019-8341 Code injection in n/a Critical 9.8
• CVE-2019-6438 Other in n/a Critical 9.8

All Opensuse Leap vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-w6v2-qchm-grj7, UBUNTU-CVE-2020-25039.