Bug 1958252 (CVE-2021-28676) - CVE-2021-28676 python-pillow: Infinite loop in FLI image reader
Summary: CVE-2021-28676 python-pillow: Infinite loop in FLI image reader
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-28676
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1958253 1958254 1958255 1958256 1959683 1962538 1962539
Blocks: 1958269
TreeView+ depends on / blocked
 
Reported: 2021-05-07 14:06 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-11-09 18:51 UTC (History)
11 users (show)

Fixed In Version: python-pillow-8.2.0
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in python-pillow. FliDecode.c did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load. This issue dates to the PIL fork. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-11-09 18:51:38 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:4149 0 None None None 2021-11-09 17:24:43 UTC

Description Guilherme de Almeida Suckevicz 2021-05-07 14:06:13 UTC 
FliDecode.c did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load. This dates to the PIL fork.

References:
https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#security
https://github.com/python-pillow/Pillow/pull/5377
Comment 1 Guilherme de Almeida Suckevicz 2021-05-07 14:06:53 UTC 
Created mingw-python-pillow tracking bugs for this issue:

Affects: fedora-all [bug 1958256]


Created python-pillow tracking bugs for this issue:

Affects: fedora-all [bug 1958253]


Created python2-pillow tracking bugs for this issue:

Affects: fedora-all [bug 1958254]


Created python3-pillow tracking bugs for this issue:

Affects: epel-7 [bug 1958255]
Comment 4 Sam Fowler 2021-05-11 00:27:32 UTC 
Mitigation:

To mitigate this feature on Red Hat Quay keep the invoice generation feature disabled, as it is by default.
Comment 6 Riccardo Schirone 2021-05-20 08:43:48 UTC 
Upstream patch:
https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856
Comment 10 errata-xmlrpc 2021-11-09 17:24:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4149 https://access.redhat.com/errata/RHSA-2021:4149
Comment 11 Product Security DevOps Team 2021-11-09 18:51:36 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-28676
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