CVE-2013-6371

The hash functionality in json-c before 0.12 allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted JSON data, involving collisions.

Updated json-c packages fix security vulnerabilities:

Florian Weimer reported that the printbuf APIs used in the json-c library used ints for counting buffer lengths, which is inappropriate for 32bit architectures. These functions need to be changed to using size_t if possible for sizes, or to be hardened against negative values if not. This could be used to cause a denial of service in an application linked to the json-c library (CVE-2013-6370).

Florian Weimer reported that the hash function in the json-c library was weak, and that parsing smallish JSON strings showed quadratic timing behaviour. This could cause an application linked to the json-c library, and that processes some specially-crafted JSON data, to use excessive amounts of CPU (CVE-2013-6371).

These are all security issues fixed in the libjson-c-devel-0.12.1-1.3 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the rsyslog-8.23.0-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the json-c-devel-0.19-1.1 package on the GA media of openSUSE Tumbleweed.

The hash functionality in json-c before 0.12 allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted JSON data, involving collisions.

Florian Weimer discovered that json-c incorrectly handled buffer lengths. An attacker could use this issue with a specially-crafted large JSON document to cause json-c to crash, resulting in a denial of service. (CVE-2013-6370)

Florian Weimer discovered that json-c incorrectly handled hash arrays. An attacker could use this issue with a specially-crafted JSON document to cause json-c to consume CPU resources, resulting in a denial of service. (CVE-2013-6371)