Bug 1970487 (CVE-2021-3593) - CVE-2021-3593 QEMU: slirp: invalid pointer initialization may lead to information disclosure (udp6)
Summary: CVE-2021-3593 QEMU: slirp: invalid pointer initialization may lead to informa...
Keywords:
Status: NEW
Alias: CVE-2021-3593
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: 1970835 1970839 1970842 1970834 1970836 1970837 1970838 1970840 1972245 1972247 1972250
Blocks: 1969478 1970557
TreeView+ depends on / blocked
 
Reported: 2021-06-10 14:51 UTC by Mauro Matteo Cascella
Modified: 2021-08-04 07:50 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 udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality.
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Description Mauro Matteo Cascella 2021-06-10 14:51:49 UTC
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The function udp6_input() handles requests for the udp protocol from the guest. While processing a udp packet that is smaller than the size of the udphdr structure it uses memory from outside the working mbuf buffer. This issue may lead to out of bound read access or indirect memory disclosure to the guest.

Upstream commits:
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/93e645e7
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/de71c15d

Comment 5 Mauro Matteo Cascella 2021-06-15 13:51:20 UTC
Created libslirp tracking bugs for this issue:

Affects: epel-all [bug 1972247]
Affects: fedora-all [bug 1972250]


Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1972245]


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