Bug 1194248 (CVE-2021-45940)

Summary: VUL-0: CVE-2021-45940: libbpf: heap-based buffer overflow (4 bytes) in __bpf_object__open (called from bpf_object__open_mem and bpf-object-fuzzer.c).
Product: [Novell Products] SUSE Security Incidents Reporter: Alexander Bergmann <abergmann>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: IN_PROGRESS --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: carlos.lopez, mrostecki, pgajdos, shung-hsi.yu, smash_bz, thomas.leroy, tonyj
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/319366/
Whiteboard: CVSSv3.1:SUSE:CVE-2021-45940:5.1:(AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Alexander Bergmann 2022-01-03 15:35:57 UTC
CVE-2021-45940

libbpf 0.6.0 and 0.6.1 has a heap-based buffer overflow (4 bytes) in
__bpf_object__open (called from bpf_object__open_mem and bpf-object-fuzzer.c).

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-45940
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=40868
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libbpf/OSV-2021-1562.yaml
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45940
Comment 1 Petr Gajdos 2022-01-04 10:03:54 UTC
This is interesting:

libbpf[1]> grep SUSE:SLE
SUSE:SLE-15-SP3:GA                                                 libbpf
SUSE:SLE-15-SP4:GA                                                 libbpf
libbpf[1]> isc ls SUSE:SLE-15-SP3:GA/libbpf
libbpf.changes
libbpf.spec
libbpf[0]> isc ls SUSE:SLE-15-SP4:GA/libbpf
baselibs.conf
libbpf-0.5.0.tar.gz
libbpf.changes
libbpf.spec
libbpf[0]>

How could that happen that there is just .spec and .changes?
Comment 2 Petr Gajdos 2022-01-04 10:04:16 UTC
Removing wrong needinfo.
Comment 3 Petr Gajdos 2022-01-04 10:19:59 UTC
(In reply to Petr Gajdos from comment #1)
> This is interesting:

Not really. BuildRequires:  kernel-source is the difference.
Comment 11 Shung-Hsi Yu 2022-10-21 08:27:37 UTC
Fix is now merged upstream https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?h=for-next&id=51deedc9b8680953437dfe359e5268120de10e30, the same fix needed for bug 1194249.

This only affects Tumbleweed/Factory. I'll apply the fix there.
Comment 12 Shung-Hsi Yu 2022-11-08 08:08:34 UTC
Fix submitted to Tumbleweed/Factory in SR#1034423.
Reassigning back to security team.