CVE-2021-27923: Input Validation
First published: Wed Mar 03 2021(Updated: )
Pillow before 8.1.1 allows attackers to cause a denial of service (memory consumption) because the reported size of a contained image is not properly checked for an ICO container, and thus an attempted memory allocation can be very large.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/Pillow | <8.1.1 | 8.1.1 |
| redhat/python-pillow | <8.1.2 | 8.1.2 |
| redhat/python-pillow | <0:5.1.1-16.el8 | 0:5.1.1-16.el8 |
| Python Pillow | <8.1.1 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 |
Remedy
Disable the invoice generation feature to mitigate this vulnerability in Red Hat Quay.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-27923 https://nvd.nist.gov/vuln/detail/CVE-2021-27923
- https://bugzilla.redhat.com/show_bug.cgi?id=1935401
- https://access.redhat.com/errata/RHSA-2021:4149
- https://access.redhat.com/errata/RHSA-2021:3917
- https://access.redhat.com/security/cve/cve-2021-27923
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ/
- https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
- https://security.gentoo.org/glsa/202107-33
- https://pillow.readthedocs.io/en/stable/releasenotes/8.1.2.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935405
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935402
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935403
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1935404
- https://github.com/python-pillow/Pillow/commit/480f6819b592d7f07b9a9a52a7656c10bbe07442
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ/
- https://nvd.nist.gov/vuln/detail/CVE-2021-27923
- https://github.com/python-pillow/Pillow/commit/756fff33128a0b643d10518a26ad04b726dd8973
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ
- https://github.com/advisories/GHSA-95q3-8gr9-gm8w (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-42.yaml
Frequently Asked Questions
What is the vulnerability ID for this flaw?
The vulnerability ID for this flaw is CVE-2021-27923.
What is the severity rating of CVE-2021-27923?
CVE-2021-27923 has a severity rating of 7.5 (high).
How can this vulnerability be exploited?
This vulnerability can be exploited to cause a denial of service by consuming excessive memory.
Which software versions are affected by CVE-2021-27923?
Versions up to and including Pillow 8.1.1 are affected by CVE-2021-27923.
How can I fix CVE-2021-27923?
To fix CVE-2021-27923, update your Python Pillow package to version 8.1.2 or higher.
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