-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-4430-1 security@xxxxxxxxxx https://www.debian.org/security/ Yves-Alexis Perez April 10, 2019 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : wpa CVE ID : CVE-2019-9495 CVE-2019-9497 CVE-2019-9498 CVE-2019-9499 Debian Bug : 926801 Mathy Vanhoef (NYUAD) and Eyal Ronen (Tel Aviv University & KU Leuven) found multiple vulnerabilities in the WPA implementation found in wpa_supplication (station) and hostapd (access point). These vulnerability are also collectively known as "Dragonblood". CVE-2019-9495 Cache-based side-channel attack against the EAP-pwd implementation: an attacker able to run unprivileged code on the target machine (including for example javascript code in a browser on a smartphone) during the handshake could deduce enough information to discover the password in a dictionary attack. CVE-2019-9497 Reflection attack against EAP-pwd server implementation: a lack of validation of received scalar and elements value in the EAP-pwd-Commit messages could result in attacks that would be able to complete EAP-pwd authentication exchange without the attacker having to know the password. This does not result in the attacker being able to derive the session key, complete the following key exchange and access the network. CVE-2019-9498 EAP-pwd server missing commit validation for scalar/element: hostapd doesn't validate values received in the EAP-pwd-Commit message, so an attacker could use a specially crafted commit message to manipulate the exchange in order for hostapd to derive a session key from a limited set of possible values. This could result in an attacker being able to complete authentication and gain access to the network. CVE-2019-9499 EAP-pwd peer missing commit validation for scalar/element: wpa_supplicant doesn't validate values received in the EAP-pwd-Commit message, so an attacker could use a specially crafted commit message to manipulate the exchange in order for wpa_supplicant to derive a session key from a limited set of possible values. This could result in an attacker being able to complete authentication and operate as a rogue AP. Note that the Dragonblood moniker also applies to CVE-2019-9494 and CVE-2014-9496 which are vulnerabilities in the SAE protocol in WPA3. SAE is not enabled in Debian stretch builds of wpa, which is thus not vulnerable by default. Due to the complexity of the backporting process, the fix for these vulnerabilities are partial. Users are advised to use strong passwords to prevent dictionary attacks or use a 2.7-based version from stretch-backports (version above 2:2.7+git20190128+0c1e29f-4). For the stable distribution (stretch), these problems have been fixed in version 2:2.4-1+deb9u3. We recommend that you upgrade your wpa packages. For the detailed security status of wpa please refer to its security tracker page at: https://security-tracker.debian.org/tracker/wpa Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEE8vi34Qgfo83x35gF3rYcyPpXRFsFAlyu2lQACgkQ3rYcyPpX RFtamggAlq8telLPhKzD1+Ns+Pci+Y+WkOAmUpn4XQ0TOmG18sDU1iS2xNHF+buA lXVKLp7zgE4VFJsclHAJXtp8anyo7YU99NzUcSF6vboRm3msifL4eE3S7IS9fAaH 0WWCHwlHMf9IGHqBn9mkwiYySwlId8ps3lvoVV2EOB4wJqa4Y6d4YrqPyFzWop56 jKTlTcJqvQBUFo/y9In/sx8QgONhNwnNAKcrBfiVwn8QHuMRA4c4UJz+NN38ctyt djA/zqT/uXwWhr8Mfl7J+rfdsC5TFPl45qr/gbmB7GRlU2la0dGJv/l0afbINrrG NoAgpOeMrwijIdDJ9vG6O3YVV6bIkg== =OkO5 -----END PGP SIGNATURE-----
