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Bug 1179686 - (CVE-2020-27821) VUL-0: CVE-2020-27821: kvm,qemu: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c
(CVE-2020-27821)
VUL-0: CVE-2020-27821: kvm,qemu: heap buffer overflow in msix_table_mmio_writ...
Status: RESOLVED FIXED
Classification: Novell Products
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents
unspecified
Other Other
: P3 - Medium : Normal
: ---
Assigned To: Security Team bot
Security Team bot
https://smash.suse.de/issue/272681/
CVSSv3.1:SUSE:CVE-2020-27821:5.7:(AV:...
:
Depends on:
Blocks:
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Reported: 2020-12-07 12:45 UTC by Robert Frohl
Modified: 2022-09-16 12:21 UTC (History)
3 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Robert Frohl 2020-12-07 12:45:15 UTC 
rh#1902651

A heap buffer overflow was found in the Message Signaled Interrupt (MSI-X) device support of QEMU. The overflow could occur due to an out-of-bounds write of the MSIX table while performing MSI-X mmio operations in msix_table_mmio_write(). A guest user may exploit this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1902651
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-27821
https://access.redhat.com/security/cve/CVE-2020-27821
Comment 1 Robert Frohl 2020-12-07 12:48:18 UTC 
only patch reference I could find so far in RH bugzilla [0]:

> ---
>  softmmu/physmem.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/softmmu/physmem.c b/softmmu/physmem.c
> index 3027747c03..d2c0010ea0 100644
> --- a/softmmu/physmem.c
> +++ b/softmmu/physmem.c
> @@ -3255,6 +3255,7 @@ int64_t address_space_cache_init(MemoryRegionCache *cache,
>      AddressSpaceDispatch *d;
>      hwaddr l;
>      MemoryRegion *mr;
> +    Int128 diff;
>  
>      assert(len > 0);
>  
> @@ -3263,6 +3264,8 @@ int64_t address_space_cache_init(MemoryRegionCache *cache,
>      d = flatview_to_dispatch(cache->fv);
>      cache->mrs = *address_space_translate_internal(d, addr, &cache->xlat, &l, true);
>  
> +    diff = int128_sub(cache->mrs.size, int128_make64(cache->xlat));
> +    l = int128_get64(int128_min(diff, int128_make64(l)));
>      mr = cache->mrs.mr;
>      memory_region_ref(mr);
>      if (memory_access_is_direct(mr, is_write)) {
> -- 

[0]https://bugzilla.redhat.com/show_bug.cgi?id=1902651#c4
Comment 2 Robert Frohl 2020-12-07 12:49:00 UTC 
(In reply to Robert Frohl from comment #1)
> only patch reference I could find so far in RH bugzilla [0]:
> 

regarding author:
> The following patch has been developed by Paolo Bonzini. It will soon land in the coming release of QEMU (5.2).
Comment 3 Bruce Rogers 2021-03-21 01:05:06 UTC 
Fix is commit 4bfb024bc76973d40a359476dc0291f46e435442
Comment 4 Bruce Rogers 2021-03-26 02:35:40 UTC 
In examining the code, it doesn't make sense to try to backport to releases based on qemu v2.11 or earlier. So fixes are done, reassigning to security-team.
Comment 5 OBSbugzilla Bot 2021-03-30 22:50:16 UTC 
This is an autogenerated message for OBS integration:
This bug (1179686) was mentioned in
https://build.opensuse.org/request/show/882234 Factory / qemu
Comment 7 Swamp Workflow Management 2021-04-16 16:16:41 UTC 
SUSE-SU-2021:1243-1: An update that solves 15 vulnerabilities and has two fixes is now available.

Category: security (important)
Bug References: 1172385,1173612,1176673,1176682,1176684,1178174,1178400,1178934,1179466,1179467,1179468,1179686,1181108,1182425,1182577,1182968,1184064
CVE References: CVE-2020-12829,CVE-2020-15469,CVE-2020-25084,CVE-2020-25624,CVE-2020-25625,CVE-2020-25723,CVE-2020-27616,CVE-2020-27617,CVE-2020-27821,CVE-2020-28916,CVE-2020-29129,CVE-2020-29130,CVE-2020-29443,CVE-2021-20257,CVE-2021-3416
JIRA References: 
Sources used:
SUSE MicroOS 5.0 (src):    qemu-4.2.1-11.16.3
SUSE Linux Enterprise Module for Server Applications 15-SP2 (src):    qemu-4.2.1-11.16.3
SUSE Linux Enterprise Module for Basesystem 15-SP2 (src):    qemu-4.2.1-11.16.3

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 8 Swamp Workflow Management 2021-04-16 16:20:03 UTC 
SUSE-SU-2021:1245-1: An update that solves 25 vulnerabilities and has four fixes is now available.

Category: security (important)
Bug References: 1172383,1172384,1172385,1172386,1172478,1173612,1174386,1174641,1175441,1176673,1176682,1176684,1178049,1178174,1178565,1178934,1179466,1179467,1179468,1179686,1180523,1181108,1181639,1181933,1182137,1182425,1182577,1182968,1183979
CVE References: CVE-2020-11947,CVE-2020-12829,CVE-2020-13361,CVE-2020-13362,CVE-2020-13659,CVE-2020-13765,CVE-2020-14364,CVE-2020-15469,CVE-2020-15863,CVE-2020-16092,CVE-2020-25084,CVE-2020-25624,CVE-2020-25625,CVE-2020-25723,CVE-2020-27617,CVE-2020-27821,CVE-2020-28916,CVE-2020-29129,CVE-2020-29130,CVE-2020-29443,CVE-2021-20181,CVE-2021-20203,CVE-2021-20221,CVE-2021-20257,CVE-2021-3416
JIRA References: 
Sources used:
SUSE Manager Server 4.0 (src):    qemu-3.1.1.1-9.24.3
SUSE Manager Retail Branch Server 4.0 (src):    qemu-3.1.1.1-9.24.3
SUSE Manager Proxy 4.0 (src):    qemu-3.1.1.1-9.24.3
SUSE Linux Enterprise Server for SAP 15-SP1 (src):    qemu-3.1.1.1-9.24.3
SUSE Linux Enterprise Server 15-SP1-LTSS (src):    qemu-3.1.1.1-9.24.3
SUSE Linux Enterprise Server 15-SP1-BCL (src):    qemu-3.1.1.1-9.24.3
SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src):    qemu-3.1.1.1-9.24.3
SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src):    qemu-3.1.1.1-9.24.3
SUSE Enterprise Storage 6 (src):    qemu-3.1.1.1-9.24.3
SUSE CaaS Platform 4.0 (src):    qemu-3.1.1.1-9.24.3

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 9 Swamp Workflow Management 2021-04-16 16:36:48 UTC 
SUSE-SU-2021:1242-1: An update that solves 21 vulnerabilities and has 5 fixes is now available.

Category: security (important)
Bug References: 1172383,1172385,1172386,1172478,1173612,1176673,1176682,1176684,1178049,1178174,1178934,1179466,1179467,1179468,1179686,1179725,1179726,1180523,1181108,1181639,1181933,1182137,1182425,1182577,1182968,1183979
CVE References: CVE-2020-11947,CVE-2020-12829,CVE-2020-13362,CVE-2020-13659,CVE-2020-13765,CVE-2020-15469,CVE-2020-25084,CVE-2020-25624,CVE-2020-25625,CVE-2020-25723,CVE-2020-27617,CVE-2020-27821,CVE-2020-28916,CVE-2020-29129,CVE-2020-29130,CVE-2020-29443,CVE-2021-20181,CVE-2021-20203,CVE-2021-20221,CVE-2021-20257,CVE-2021-3416
JIRA References: 
Sources used:
SUSE Linux Enterprise Server 12-SP5 (src):    qemu-3.1.1.1-48.2

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 10 Swamp Workflow Management 2021-04-23 16:26:02 UTC 
openSUSE-SU-2021:0600-1: An update that solves 15 vulnerabilities and has two fixes is now available.

Category: security (important)
Bug References: 1172385,1173612,1176673,1176682,1176684,1178174,1178400,1178934,1179466,1179467,1179468,1179686,1181108,1182425,1182577,1182968,1184064
CVE References: CVE-2020-12829,CVE-2020-15469,CVE-2020-25084,CVE-2020-25624,CVE-2020-25625,CVE-2020-25723,CVE-2020-27616,CVE-2020-27617,CVE-2020-27821,CVE-2020-28916,CVE-2020-29129,CVE-2020-29130,CVE-2020-29443,CVE-2021-20257,CVE-2021-3416
JIRA References: 
Sources used:
openSUSE Leap 15.2 (src):    qemu-4.2.1-lp152.9.12.1, qemu-linux-user-4.2.1-lp152.9.12.1, qemu-testsuite-4.2.1-lp152.9.12.1
Comment 13 Swamp Workflow Management 2021-06-10 13:38:51 UTC 
SUSE-SU-2021:1942-1: An update that solves 14 vulnerabilities and has three fixes is now available.

Category: security (important)
Bug References: 1149813,1163019,1175144,1175534,1176681,1178683,1178935,1179477,1179484,1179686,1181103,1182282,1182425,1182968,1182975,1183373,1186290
CVE References: CVE-2019-15890,CVE-2020-14364,CVE-2020-17380,CVE-2020-25085,CVE-2020-25707,CVE-2020-25723,CVE-2020-27821,CVE-2020-29129,CVE-2020-29130,CVE-2020-8608,CVE-2021-20263,CVE-2021-3409,CVE-2021-3416,CVE-2021-3419
JIRA References: 
Sources used:
SUSE Linux Enterprise Module for Server Applications 15-SP3 (src):    qemu-5.2.0-17.1
SUSE Linux Enterprise Module for Basesystem 15-SP3 (src):    qemu-5.2.0-17.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Comment 14 Swamp Workflow Management 2021-07-11 14:07:51 UTC 
openSUSE-SU-2021:1942-1: An update that solves 14 vulnerabilities and has three fixes is now available.

Category: security (important)
Bug References: 1149813,1163019,1175144,1175534,1176681,1178683,1178935,1179477,1179484,1179686,1181103,1182282,1182425,1182968,1182975,1183373,1186290
CVE References: CVE-2019-15890,CVE-2020-14364,CVE-2020-17380,CVE-2020-25085,CVE-2020-25707,CVE-2020-25723,CVE-2020-27821,CVE-2020-29129,CVE-2020-29130,CVE-2020-8608,CVE-2021-20263,CVE-2021-3409,CVE-2021-3416,CVE-2021-3419
JIRA References: 
Sources used:
openSUSE Leap 15.3 (src):    qemu-5.2.0-17.1
Comment 15 Carlos López 2022-09-16 12:21:48 UTC 
Done, closing.
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