Bug 1939157 (CVE-2021-20304) - CVE-2021-20304 OpenEXR: Undefined-shift in Imf_2_5::hufDecode
Summary: CVE-2021-20304 OpenEXR: Undefined-shift in Imf_2_5::hufDecode
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2021-20304
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1939188 1944917 1944918 1944919 1944920
Blocks: 1929339
TreeView+ depends on / blocked
 
Reported: 2021-03-15 17:27 UTC by Michael Kaplan
Modified: 2023-01-31 12:04 UTC (History)
5 users (show)

Fixed In Version: OpenEXR 3.0.0-beta
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-11-02 23:21:02 UTC
Embargoed:

Attachments (Terms of Use)

Description Michael Kaplan 2021-03-15 17:27:24 UTC 
Undefined-shift in Imf_2_5::hufDecode
Comment 1 Michael Kaplan 2021-03-15 17:27:28 UTC 
External References:

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26229
Comment 2 Michael Kaplan 2021-03-15 17:46:22 UTC 
Created OpenEXR tracking bugs for this issue:

Affects: fedora-all [bug 1939188]
Comment 3 Todd Cullum 2021-03-30 22:54:13 UTC 
Upstream patch: https://github.com/AcademySoftwareFoundation/openexr/commit/51a92d67f53c08230734e74564c807043cbfe41e

Flaw summary:

In hufDecode of IlmImf/ImfHuf.cpp, if lc < 0, the getCode macro function could perform an undefined bitwise right shift with unintended consequences upon execution of `unsigned char cs = (c >> lc);` lc is controllable via the input buffer. This could potentially lead to an impact on application availability when OpenEXR processes a crafted input file.
Note You need to log in before you can comment on or make changes to this bug.