[Pkg-xen-devel] Bug#859560: xen: CVE-2017-7228: x86: broken check in memory_exchange() permits PV guest breakout (XSA-212)

[Niels Thykier]

On Tue, 04 Apr 2017 21:49:44 +0200 Salvatore Bonaccorso
<carnil at debian.org> wrote:
> Source: xen
> Version: 4.8.1~pre.2017.01.23-1
> Severity: grave
> Tags: security upstream
> Justification: user security hole
> 
> Hi,
> 
> the following vulnerability was published for xen.
> 
> CVE-2017-7228[0]:
> | An issue (known as XSA-212) was discovered in Xen, with fixes available
> | for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix
> | introduced an insufficient check on XENMEM_exchange input, allowing the
> | caller to drive hypervisor memory accesses outside of the guest
> | provided input/output arrays.
> 
> If you fix the vulnerability please also make sure to include the
> CVE (Common Vulnerabilities & Exposures) id in your changelog entry.
> 
> For further information see:
> 
> [0] https://security-tracker.debian.org/tracker/CVE-2017-7228
>     https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7228
> [1] https://xenbits.xen.org/xsa/advisory-212.html
> 
> Please adjust the affected versions in the BTS as needed.
> 
> Regards,
> Salvatore
> 
> 

Hi Xen maintainers,

Is there any update on this bug?

Thanks,
~Niels