CVE-2020-35513 — Privilege Dropping / Lowering Errors in Linux

CWE-271 — Privilege Dropping / Lowering Errors6 documents6 sources
Severity
4.9MEDIUMNVD
EPSS
0.3%
top 45.22%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Linux KernelDebian LinuxRedhat Enterprise Linux
Timeline
PublishedJan 26
Latest updateSep 26

Description

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A user with access to the NFS could use this flaw to starve the resources causing denial of service.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:HExploitability: 1.2 | Impact: 3.6

Affected Packages4 packages

▶Debianlinux/linux_kernel< 4.16.5-1+3
▶CVEListV5linux/linux_kernelbefore kernel 4.17-rc1
▶debiandebian/linux< linux 4.16.5-1 (bookworm)

Also affects: Enterprise Linux 7.0

Patches

Patch: bugzilla.redhat.com ↗Patch: bugzilla.redhat.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-7qpq-c35p-wc3c: A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user cre↗2022-05-24
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OSV
CVE-2020-35513: A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user cre↗2021-01-26
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📋Vendor Advisories

2
Red Hat
kernel: Nfsd failure to clear umask after processing an open or create↗2020-12-21
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Debian
CVE-2020-35513: linux - A flaw incorrect umask during file or directory modification in the Linux kernel...↗2020
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📄Research Papers

1
arXiv
Timeloops: Automatic System Call Policy Learning for Containerized Microservices↗2022-09-26
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CVE-2020-35513 — Privilege Dropping / Lowering Errors | cvebase