CVE-2021-28676: Input Validation
First published: Thu Apr 01 2021(Updated: )
An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/Pillow | <8.2.0 | 8.2.0 |
| Python Pillow | <8.2.0 | |
| Fedoraproject Fedora | =33 | |
| redhat/python-pillow | <8.2.0 | 8.2.0 |
| redhat/python-pillow | <0:5.1.1-16.el8 | 0:5.1.1-16.el8 |
Remedy
To mitigate this feature on Red Hat Quay, keep the invoice generation feature disabled, as it is by default.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-28676 https://nvd.nist.gov/vuln/detail/CVE-2021-28676 https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#security
- https://bugzilla.redhat.com/show_bug.cgi?id=1958252
- https://access.redhat.com/errata/RHSA-2021:4149
- https://access.redhat.com/security/cve/cve-2021-28676
- https://github.com/python-pillow/Pillow/pull/5377
- https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
- https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos
- https://security.gentoo.org/glsa/202107-33
- https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
- https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#security
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1958256
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1958253
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1958254
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1958255
- https://nvd.nist.gov/vuln/detail/CVE-2021-28676
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL
- https://github.com/advisories/GHSA-7r7m-5h27-29hp (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-92.yaml
Frequently Asked Questions
What is CVE-2021-28676?
CVE-2021-28676 is a vulnerability in Pillow before version 8.2.0 that could lead to an infinite loop on load, potentially impacting system availability.
How does CVE-2021-28676 affect the system availability?
CVE-2021-28676 can affect system availability by causing an infinite loop on load.
What is the severity of CVE-2021-28676?
CVE-2021-28676 is classified as a high severity vulnerability with a severity value of 7.
Which software is affected by CVE-2021-28676?
Python Pillow versions before 8.2.0, specifically version 0:5.1.1-16.el8, are affected by CVE-2021-28676.
How do I fix CVE-2021-28676?
To fix CVE-2021-28676, upgrade to version 8.2.0 of Python Pillow, which includes the necessary security patches.
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