Bug 1984646 (CVE-2021-36976) - CVE-2021-36976 libarchive: use-after-free in copy_string()
Summary: CVE-2021-36976 libarchive: use-after-free in copy_string()
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-36976
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: 1984647 1984648 1985190
Blocks: 1984649
TreeView+ depends on / blocked
 
Reported: 2021-07-21 20:10 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 13:15 UTC (History)
15 users (show)

Fixed In Version:
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Doc Text:
A use-after-free flaw was found in libarchive in the copy_string function.
Clone Of:
Environment:
Last Closed: 2022-05-17 13:15:11 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-07-21 20:10:55 UTC 
libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Reference:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375
Comment 1 Guilherme de Almeida Suckevicz 2021-07-21 20:11:47 UTC 
Created libarchive tracking bugs for this issue:

Affects: fedora-all [bug 1984647]


Created mingw-libarchive tracking bugs for this issue:

Affects: fedora-all [bug 1984648]
Comment 2 Doran Moppert 2021-07-22 06:07:39 UTC 
This appears to not have been reported upstream.  

Attaching a patch that adds the test against the first upstream affected commit (47bb8187).  Running that test with asan results in UAF .. but the UAF region was allocated by the previous test, so it looks like something not initialized properly when reading the reproducer.
Comment 18 Product Security DevOps Team 2022-05-17 13:15:08 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-2021-36976
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