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Bug 745396 (CVE-2020-25741, CVE-2020-25742, CVE-2020-25743) - app-emulation/qemu: NULL pointer derefrence issues (CVE-2020-{25741,25742,25743})
Summary: app-emulation/qemu: NULL pointer derefrence issues (CVE-2020-{25741,25742,257...
Status: UNCONFIRMED
Alias: CVE-2020-25741, CVE-2020-25742, CVE-2020-25743
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
URL: https://seclists.org/oss-sec/2020/q3/201
Whiteboard: B3 [upstream/ebuild]
Keywords:
Depends on:
Blocks:
 
Reported: 2020-09-29 11:18 UTC by filip ambroz
Modified: 2020-10-01 08:42 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description filip ambroz 2020-09-29 11:18:28 UTC
CVE-2020-25741 QEMU: fdc: null pointer dereference during r/w data transfer

A null pointer dereference issue was found in the Floppy disk emulator of QEMU. It could occur while transferring data via fdctrl_read_data(), fdctrl_write_data() routines, if current drive has a null block pointer. A guest may use this flaw to crash the QEMU process on the host resulting in DoS scenario.


References:
-----------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg07779.html
  -> https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Ffdc_nullptr1
===

2. CVE-2020-25742 QEMU: scsi: lsi: null pointer dereference during memory move

A null pointer dereference issue was found in the LSI53C895A SCSI Host Bus Adapter emulator of QEMU. It could occur while processing 'Memory Move' instructions to move data between dma memory and i/o address space via lsi_memcpy(). A guest user/process may use this flaw to crash the QEMU process resulting in DoS scenario.


References:
-----------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.html
  -> https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1
===


3. CVE-2020-25743 QEMU: ide: null pointer dereference while cancelling i/o operation

A null pointer dereference issue was found in the IDE disk emulator of QEMU. It could occur while cancelling an i/o operation via ide_cancel_dma_sync() routine, if a block drive pointer is null. A guest may use this flaw to crash the QEMU process on the host resulting in DoS scenario.


References:
-----------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg01568.html
  -> https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b


* These issues were reported by Sergej Schumilo, Cornelius Aschermann, Simon
  Wrner of Ruhr-University Bochum.

Other Links:
https://www.suse.com/security/cve/CVE-2020-25741/
https://www.suse.com/security/cve/CVE-2020-25743/

Reproducible: Always
Comment 1 Sergei Trofimovich gentoo-dev 2020-09-30 22:00:00 UTC
We will wait when correct fix lands upstream.
Comment 2 filip ambroz 2020-09-30 22:06:33 UTC
(In reply to Sergei Trofimovich from comment #1)
> We will wait when correct fix lands upstream.

thank you for answer, I changed the whiteboard