usb: storage: sierra_ms: reject short SWoC info transfers
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: storage: sierra_ms: reject short SWoC info transfers sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes from the device via usb_control_msg(), but its callers only treat a negative return value as failure. A device that answers the vendor-specific GetSwocInfo request with a short IN transfer is therefore accepted, leaving the tail of the freshly allocated (kmalloc(), non-zeroing) swoc_info buffer uninitialized. truinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU and swocInfo->LinuxVer from that buffer into the world-readable (0444) "truinst" sysfs attribute. An emulated/malicious USB device (VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes of stale kernel heap memory (kmalloc-64) to unprivileged userspace, once per sysfs read, indefinitely. On kernels built without init_on_alloc this leaks recently freed heap contents. Only accept the transfer when the full structure was received. sierra_ms_init() already retries failed queries, so well-behaved devices are unaffected.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 32fe5e393455d87db4988af03915634304870fb4 · fixed in 4faaad69f18332246bbd4ca41718beb2a305bb72; From 32fe5e393455d87db4988af03915634304870fb4 · fixed in c85e8331d298b8f1dee8fe63718e76435cec7133; From 32fe5e393455d87db4988af03915634304870fb4 · fixed in e2d62928f2666a2964a23b1d39e6e762f0628d7b; From 32fe5e393455d87db4988af03915634304870fb4 · fixed in db9d3be156baca6ef80ae5d93acfeb85c61a74dd; From 32fe5e393455d87db4988af03915634304870fb4 · fixed in 8a0200d14acd9db388b85cd016e68a4e60d900ec
- Linux Linux
2.6.27
- KernelLinux
From 2.6.27 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10