Bug 1970484 (CVE-2021-3592) - CVE-2021-3592 QEMU: slirp: invalid pointer initialization may lead to information disclosure (bootp)
Summary: CVE-2021-3592 QEMU: slirp: invalid pointer initialization may lead to informa...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3592
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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Depends On: 1970819 1970820 1970821 1970822 1970823 1970824 1970825 1970826 1972244 1972246 1972249
Blocks: 1969478 1970557
TreeView+ depends on / blocked
 
Reported: 2021-06-10 14:41 UTC by Mauro Matteo Cascella
Modified: 2022-04-17 21:27 UTC (History)
27 users (show)

Fixed In Version: libslirp 4.6.0
Doc Type: If docs needed, set a value
Doc Text:
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality.
Clone Of:
Environment:
Last Closed: 2021-11-09 22:54:32 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:4191 0 None None None 2021-11-09 17:39:52 UTC

Description Mauro Matteo Cascella 2021-06-10 14:41:36 UTC 
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The function bootp_input() in src/bootp.c handles requests for the bootp protocol from the guest. While processing a udp packet that is smaller than the size of the bootp_t structure (548 bytes) it uses memory from outside the working mbuf buffer. This may lead to the leakage of 10 bytes of uninitialized heap memory to the guest.

Upstream commits:
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e7
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/f13cad45
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/2eca0838
Comment 5 Mauro Matteo Cascella 2021-06-15 13:51:20 UTC 
Created libslirp tracking bugs for this issue:

Affects: epel-all [bug 1972246]
Affects: fedora-all [bug 1972249]


Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1972244]
Comment 6 errata-xmlrpc 2021-11-09 17:39:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4191 https://access.redhat.com/errata/RHSA-2021:4191
Comment 7 Product Security DevOps Team 2021-11-09 22:54:29 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-2021-3592
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