In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
usb: storage: sierra_ms: reject short SWoC info transfers<\/p>\n
sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes
\nfrom the device via usb_control_msg(), but its callers only treat a
\nnegative return value as failure. A device that answers the
\nvendor-specific GetSwocInfo request with a short IN transfer is
\ntherefore accepted, leaving the tail of the freshly allocated
\n(kmalloc(), non-zeroing) swoc_info buffer uninitialized.<\/p>\n
truinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU
\nand swocInfo->LinuxVer from that buffer into the world-readable
\n(0444) “truinst” sysfs attribute. An emulated\/malicious USB device
\n(VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes
\nof stale kernel heap memory (kmalloc-64) to unprivileged userspace,
\nonce per sysfs read, indefinitely. On kernels built without
\ninit_on_alloc this leaks recently freed heap contents.<\/p>\n
Only accept the transfer when the full structure was received.
\nsierra_ms_init() already retries failed queries, so well-behaved
\ndevices are unaffected.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
usb: storage: sierra_ms: reject short SWoC info transfers<\/p>\n
sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes
\nfrom<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41243","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41243","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=41243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}