CVE-2017-12134

The xen_biovec_phys_mergeable function in drivers/xen/biomerge.c in Xen might allow local OS guest users to corrupt block device data streams and consequently obtain sensitive memory information, cause a denial of service, or gain host OS privileges by leveraging incorrect block IO merge-ability calculation.

Weakness

The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

Affected Software

Potential Mitigations

• Use languages, libraries, or frameworks that make it easier to handle numbers without unexpected consequences.
• Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).
• Use languages, libraries, or frameworks that make it easier to handle numbers without unexpected consequences.
• Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/128.html
• https://cwe.mitre.org/data/definitions/129.html

References

• https://support.citrix.com/article/CTX225941
• https://bugzilla.redhat.com/show_bug.cgi?id=1477656
• http://xenbits.xen.org/xsa/advisory-229.html
• http://www.securitytracker.com/id/1039176
• http://www.securityfocus.com/bid/100343
• http://www.openwall.com/lists/oss-security/2017/08/15/4
• http://www.debian.org/security/2017/dsa-3981
• https://security.gentoo.org/glsa/201801-14
• https://usn.ubuntu.com/3655-2/
• https://usn.ubuntu.com/3655-1/