Bug 1877786 (CVE-2020-24978) - CVE-2020-24978 nasm: double-free vulnerability in pp_tokline asm/preproc.c
Summary: CVE-2020-24978 nasm: double-free vulnerability in pp_tokline asm/preproc.c
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-24978
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:
Blocks: 1877787
TreeView+ depends on / blocked
 
Reported: 2020-09-10 12:50 UTC by Michael Kaplan
Modified: 2021-02-16 19:16 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-09-11 01:17:44 UTC
Embargoed:

Attachments (Terms of Use)

Description Michael Kaplan 2020-09-10 12:50:00 UTC 
In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

References:

https://bugzilla.nasm.us/show_bug.cgi?id=3392712
Comment 2 Todd Cullum 2020-09-10 22:23:47 UTC 
This would not reproduce for me on nasm 2.10.07 or 2.13.03. Upon further inspection of the source code pp_tokline does not exist in these versions yet, it seems it was introduced in commit a7afe276da2fba43fd906dbaad1497a2e0994693 tagged nasm-2.15rc1, which we do not ship.
Comment 3 Todd Cullum 2020-09-10 22:25:35 UTC 
Statement:

This flaw does not affect nasm as shipped in Red Hat Enterprise Linux 7 or 8 as the vulnerable code was committed in a newer version of nasm.
Comment 4 Product Security DevOps Team 2020-09-11 01:17:44 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-2020-24978
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