CVE-2022-2211: Buffer Overflow
First published: Fri Jun 24 2022(Updated: )
A buffer overflow was found in get_keys get_keys() When calculating the greatest possible number of matching keys in get_keys(), the current expression MIN (1, ks->nr_keys) is wrong -- it will return at most 1. If all "nr_keys" keys match however, then we require "nr_keys" non-NULL entries in the result array; in other words, we need MAX (1, ks->nr_keys) (The comment just above the expression is correct; the code is wrong.) This buffer overflow is easiest to trigger in those guestfs tools that parse the "--key" option in C; that is, with "OPTION_key". For example, the command $ virt-cat $(seq -f '--key /dev/sda2:key:%g' 200) -d DOMAIN /no-such-file which passes 200 (different) passphrases for the LUKS-encrypted block device "/dev/sda2", crashes with a SIGSEGV.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libguestfs Libguestfs | ||
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2022-2211
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2101279
- https://listman.redhat.com/archives/libguestfs/2022-June/029274.html
- https://listman.redhat.com/archives/libguestfs/2022-June/029277.html
- https://listman.redhat.com/archives/libguestfs/2022-June/029290.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2100862#c6
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2100862#c5
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2100862#c3
- https://access.redhat.com/errata/RHSA-2022:7472
- https://access.redhat.com/errata/RHSA-2022:7958
- https://access.redhat.com/errata/RHSA-2022:7959
- https://access.redhat.com/errata/RHSA-2022:7968
- https://access.redhat.com/security/cve/cve-2022-2211
- https://bugzilla.redhat.com/show_bug.cgi?id=2100862
Frequently Asked Questions
What is the severity of CVE-2022-2211?
The severity of CVE-2022-2211 is medium with a severity value of 6.5.
Which software is affected by CVE-2022-2211?
Libguestfs and Redhat Enterprise Linux versions 8.0 and 9.0 are affected by CVE-2022-2211.
How does CVE-2022-2211 lead to a denial of service?
CVE-2022-2211 leads to a denial of service by miscalculating the greatest possible number of matching keys in the get_keys() function.
How can I fix CVE-2022-2211?
To fix CVE-2022-2211, you should update to the latest version of libguestfs or Redhat Enterprise Linux that includes the necessary security patches.
Where can I find more information about CVE-2022-2211?
You can find more information about CVE-2022-2211 in the following references: - Bugzilla: https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2101279 - Red Hat Security Advisory: https://access.redhat.com/security/cve/CVE-2022-2211 - Libguestfs Mailing List: https://listman.redhat.com/archives/libguestfs/2022-June/029274.html
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