CVE-2026-64669: falha de alta gravidade em mcdope pam_usb
pam_usb: deny_remote bypassed by compressed IPv6 addresses in pusb_tmux_has_remote_clients
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21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 7.4epss 0.4%
pam_usb provides hardware authentication for Linux using removable media. From version 0.8.0 to before version 0.9.3, the deny_remote feature in pam_usb uses /usr/bin/w -i to detect whether the authenticating user has an active remote tmux session. In pusb_tmux_has_remote_clients() (src/tmux.c), the IPv6 detection regex required exactly four explicit colon-separated groups of 1-4 hex digits (e.g. 2001:0db8:85a3:0000). Any IPv6 address in compressed notation — including loopback (::1), link-local (fe80::1), and global unicast addresses (2001:db8::1) — did not match this pattern. As a result the remote-client check silently returned "no remote clients" even when a remote tmux client was connected from such an address. This issue has been patched in version 0.9.3.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Produtos afetados
mcdope · pam_usbCVEs relacionadas — mcdope pam_usb
No mesmo produto, das mais perigosas para as menos.
CVE-2026-64668HIGHpam_usb: deny_remote bypassed by zone-indexed IPv6 addresses (fe80::1%eth0) in pusb_tmux_has_remote_clientsEPSS 0.4%CVE-2026-48064HIGHpam_usb: PAM_RHOST check skipped when deny_remote=false allows XDMCP authentication bypassEPSS 0.3%CVE-2026-47269HIGHpam_usb: deny_remote feature incorrectly classifies IPv4-mapped IPv6 remote connections as localEPSS 0.3%CVE-2026-47273MEDIUMpam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queriesEPSS 0.3%CVE-2026-44711HIGHpam_usb: Symlink attacks on pad directory and pad files enable authentication bypass and root file corruptionEPSS 0.2%CVE-2026-64666HIGHpam_usb: getenv() in pusb_local_login bypasses XRDP deny via env-var unsetEPSS 0.2%