In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
neighbour: Enforce min\/max to NDTPA_INTERVAL_PROBE_TIME_MS.<\/p>\n
NDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses
\n.validation_type, so no validation is applied:<\/p>\n
# ynl –family rt-neigh –do setneightbl
\n –json ‘{“name”: “arp_cache”, “parms”: {“interval-probe-time-ms”: 0}}’<\/p>\n
# ynl –family rt-neigh –dump getneightbl –output-json |
\n jq ‘.[] | select(.name == “arp_cache” and has(“config”))
\n | .parms[“interval-probe-time-ms”]’
\n 0<\/p>\n
Moreover, nla_get_msecs() uses msecs_to_jiffies(), and u64 is
\nsilently cast to u32, so a larger value can bypass the min check:<\/p>\n
e.g. 4294967296 == 0x100000000<\/p>\n
# ynl –family rt-neigh –do setneightbl
\n –json ‘{“name”: “arp_cache”, “parms”: {“interval-probe-time-ms”: 4294967296}}’<\/p>\n
# ynl –family rt-neigh –dump getneightbl –output-json |
\n jq ‘.[] | select(.name == “arp_cache” and has(“config”))
\n | .parms[“interval-probe-time-ms”]’
\n 0<\/p>\n
msecs_to_jiffies() returns MAX_JIFFY_OFFSET if the value is
\nlarger than INT_MAX. Also, INT_MAX ms overflows int NEIGH_VAR()
\nwhen HZ > 1000 (Alpha, MIPS), and passing a negative integer to
\nqueue_delayed_work(unsigned long delay) causes sign extension,
\nwhich wraps around the expiry time to the past, resulting in it
\nbeing handled as 0 delay in the timer wheel.<\/p>\n
Let’s use NLA_POLICY_FULL_RANGE() and limit the max to 1 day.<\/p>\n
The same max check is applied to sysctl as well.<\/p>\n
Note that this controls the probe interval for NTF_MANAGED
\nentries, so the max of 1 day is unlikely to break any
\ndeployments.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
neighbour: Enforce min\/max to NDTPA_INTERVAL_PROBE_TIME_MS.<\/p>\n
NDTPA_INTERVAL_PROBE_TIME_MS sets .type and .min but misses
\n.validatio<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33386","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=33386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}