132 lines
6.2 KiB
JSON
132 lines
6.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-47270",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-05-18T23:03:37.229Z",
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"datePublished": "2026-05-27T20:10:37.108Z",
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"dateUpdated": "2026-05-28T13:25:31.065Z"
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},
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"containers": {
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"cna": {
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"title": "pam_usb: strtok() race condition in multi-threaded PAM hosts can corrupt deny_remote result",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-362",
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"lang": "en",
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"description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "HIGH",
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"attackVector": "LOCAL",
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"availabilityImpact": "NONE",
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"baseScore": 6.3,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-j3xw-vc43-x7jg",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-j3xw-vc43-x7jg"
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},
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{
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"name": "https://github.com/mcdope/pam_usb/commit/94f1640a61d49dfaf38e782680a52f01d5bf8b51",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/mcdope/pam_usb/commit/94f1640a61d49dfaf38e782680a52f01d5bf8b51"
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},
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{
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"name": "https://github.com/mcdope/pam_usb/commit/d003e551b794a9e3774ff4720830fb7aadaa48bd",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/mcdope/pam_usb/commit/d003e551b794a9e3774ff4720830fb7aadaa48bd"
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}
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],
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"affected": [
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{
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"vendor": "mcdope",
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"product": "pam_usb",
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"versions": [
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{
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"version": "< 0.9.0",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-05-27T20:10:37.108Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pam_usb is a PAM module loaded into the host process (sudo, login, GDM, GNOME Shell). Display managers such as GDM run multiple concurrent authentication threads. Three functions used by the deny_remote feature called the non-reentrant strtok(), which stores state in a single global pointer. If two authentications race, one thread's strtok() call can overwrite the other's in-progress tokenisation pointer, causing incorrect parsing of the tmux session data or the /proc environ scan that backs the remote-session detection logic. Additionally, pusb_tmux_get_client_tty() passed the raw pointer returned by getenv(TMUX) directly to strtok(). getenv() returns a pointer into the live process environment block; strtok() inserts NUL bytes into that block, permanently corrupting the TMUX variable for subsequent code running in the same process. In long-lived display managers this affects all future authentications in that process. The combined effect can cause deny_remote=true to return an incorrect decision for a remote session, or an incorrect decision for a local session, depending on thread interleaving. This vulnerability is fixed in 0.9.0."
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}
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],
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"source": {
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"advisory": "GHSA-j3xw-vc43-x7jg",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-28T13:25:20.725360Z",
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"id": "CVE-2026-47270",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-05-28T13:25:31.065Z"
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}
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}
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]
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}
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} |