Package: release.debian.org Severity: normal Tags: stretch User: [email protected] Usertags: pu
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi, I would like to fix CVE-2018-14526 (#905739) in stable: CVE-2018-14526[0]: | An issue was discovered in rsn_supp/wpa.c in wpa_supplicant 2.0 | through 2.6. Under certain conditions, the integrity of EAPOL-Key | messages is not checked, leading to a decryption oracle. An attacker | within range of the Access Point and client can abuse the | vulnerability to recover sensitive information. This is a low priority security issue, and doesn't require a DSA. [0] https://security-tracker.debian.org/tracker/CVE-2018-14526 - -- Cheers, Andrej -----BEGIN PGP SIGNATURE----- iQFIBAEBCAAyFiEEeuS9ZL8A0js0NGiOXkCM2RzYOdIFAltr7cYUHGFuZHJld3No QGRlYmlhbi5vcmcACgkQXkCM2RzYOdJcBQf8DDHe13GBx0EcUcvla6Z0wWQvsEVq P8tqJiYde1Z1MkJ1d8Ff9DU2NlBH302CuCZGE/eUh0g2gQuGKJ0aIMNsBywGQPnM 0Bgb7ggepVbMOLTJCC80vB9jpH5dxmP5Ae9gNP8csEUulFmIZsTR/nUCH6+9lh3j 018emZVCZl8dTrf6yf25/TJoeGCZYYxOBeSKLHlDC28dEouUMCJYzRRb6R+duhjE crQ6g5b0+7j2+ltevI0R1SB3vBFMVGq3MVdfNCh4H81Q3PwghodDejOeaKIwI9wX WMTohAFYFUfntQMNEnkTVYXZscTYfU5Zj+GA3z0EM1MRmFMZQaQseww0KQ== =I3Kc -----END PGP SIGNATURE-----
diff -Nru wpa-2.4/debian/changelog wpa-2.4/debian/changelog --- wpa-2.4/debian/changelog 2017-10-14 14:18:32.000000000 +0200 +++ wpa-2.4/debian/changelog 2018-08-09 09:23:49.000000000 +0200 @@ -1,3 +1,11 @@ +wpa (2:2.4-1+deb9u2) stretch; urgency=high + + * SECURITY UPDATE: + - CVE-2018-14526: Ignore unauthenticated encrypted EAPOL-Key data + (Closes: #905739) + + -- Andrej Shadura <[email protected]> Thu, 09 Aug 2018 09:23:49 +0200 + wpa (2:2.4-1+deb9u1) stretch-security; urgency=high * Non-maintainer upload by the Security Team. diff -Nru wpa-2.4/debian/patches/CVE-2018-14526/rebased-v2.6-0001-WPA-Ignore-unauthenticated-encrypted-EAPOL-Key-data.patch wpa-2.4/debian/patches/CVE-2018-14526/rebased-v2.6-0001-WPA-Ignore-unauthenticated-encrypted-EAPOL-Key-data.patch --- wpa-2.4/debian/patches/CVE-2018-14526/rebased-v2.6-0001-WPA-Ignore-unauthenticated-encrypted-EAPOL-Key-data.patch 1970-01-01 01:00:00.000000000 +0100 +++ wpa-2.4/debian/patches/CVE-2018-14526/rebased-v2.6-0001-WPA-Ignore-unauthenticated-encrypted-EAPOL-Key-data.patch 2018-08-09 09:17:22.000000000 +0200 @@ -0,0 +1,44 @@ +From 3e34cfdff6b192fe337c6fb3f487f73e96582961 Mon Sep 17 00:00:00 2001 +From: Mathy Vanhoef <[email protected]> +Date: Sun, 15 Jul 2018 01:25:53 +0200 +Subject: [PATCH] WPA: Ignore unauthenticated encrypted EAPOL-Key data + +Ignore unauthenticated encrypted EAPOL-Key data in supplicant +processing. When using WPA2, these are frames that have the Encrypted +flag set, but not the MIC flag. + +When using WPA2, EAPOL-Key frames that had the Encrypted flag set but +not the MIC flag, had their data field decrypted without first verifying +the MIC. In case the data field was encrypted using RC4 (i.e., when +negotiating TKIP as the pairwise cipher), this meant that +unauthenticated but decrypted data would then be processed. An adversary +could abuse this as a decryption oracle to recover sensitive information +in the data field of EAPOL-Key messages (e.g., the group key). +(CVE-2018-14526) + +Signed-off-by: Mathy Vanhoef <[email protected]> +--- + src/rsn_supp/wpa.c | 11 +++++++++++ + 1 file changed, 11 insertions(+) + +diff -upr wpa_supplicant-2.6.orig/src/rsn_supp/wpa.c wpa_supplicant-2.6/src/rsn_supp/wpa.c +--- wpa_supplicant-2.6.orig/src/rsn_supp/wpa.c 2016-10-02 21:51:11.000000000 +0300 ++++ wpa_supplicant-2.6/src/rsn_supp/wpa.c 2018-08-08 16:55:11.506831029 +0300 +@@ -2016,6 +2016,17 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, c + + if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) && + (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { ++ /* ++ * Only decrypt the Key Data field if the frame's authenticity ++ * was verified. When using AES-SIV (FILS), the MIC flag is not ++ * set, so this check should only be performed if mic_len != 0 ++ * which is the case in this code branch. ++ */ ++ if (!(key_info & WPA_KEY_INFO_MIC)) { ++ wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, ++ "WPA: Ignore EAPOL-Key with encrypted but unauthenticated data"); ++ goto out; ++ } + if (wpa_supplicant_decrypt_key_data(sm, key, ver, key_data, + &key_data_len)) + goto out; diff -Nru wpa-2.4/debian/patches/series wpa-2.4/debian/patches/series --- wpa-2.4/debian/patches/series 2017-10-14 14:16:40.000000000 +0200 +++ wpa-2.4/debian/patches/series 2018-08-09 09:17:41.000000000 +0200 @@ -45,3 +45,4 @@ 2017-1/0010-WNM-Ignore-WNM-Sleep-Mode-Response-without-pending-r.patch 2017-1/0011-FT-Do-not-allow-multiple-Reassociation-Response-fram.patch 2017-1/0012-TDLS-Ignore-incoming-TDLS-Setup-Response-retries.patch +CVE-2018-14526/rebased-v2.6-0001-WPA-Ignore-unauthenticated-encrypted-EAPOL-Key-data.patch
