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AUSCERT External Security Bulletin Redistribution
[DLA 1867-1] wpa security update
1 August 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Access Privileged Data -- Existing Account
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote with User Interaction
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2019-11555 CVE-2019-9499 CVE-2019-9498
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Package : wpa
Version : 2.3-1+deb8u8
CVE ID : CVE-2019-9495 CVE-2019-9497 CVE-2019-9498 CVE-2019-9499=20
Debian Bug : 927463
Several vulnerabilities were discovered in WPA supplicant / hostapd. Some
of them could only partially be mitigated, please read below for details.
Cache-based side-channel attack against the EAP-pwd implementation:
an attacker able to run unprivileged code on the target machine
during the handshake could deduce enough information to discover the
password in a dictionary attack.
This issue has only very partially been mitigated against by reducing
measurable timing differences during private key operations. More
work is required to fully mitigate this vulnerability.
Reflection attack against EAP-pwd server implementation: a lack of
validation of received scalar and elements value in the
EAP-pwd-Commit messages could have resulted in attacks that would
have been able to complete EAP-pwd authentication exchange without
the attacker having to know the password. This did not result in the
attacker being able to derive the session key, complete the following
key exchange and access the network.
EAP-pwd server missing commit validation for scalar/element: hostapd
didn't validate values received in the EAP-pwd-Commit message, so an
attacker could have used 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 have resulted in an
attacker being able to complete authentication and gain access to the
This issue could only partially be mitigated.
EAP-pwd peer missing commit validation for scalar/element:
wpa_supplicant didn't validate values received in the EAP-pwd-Commit
message, so an attacker could have used 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 have resulted in an attacker being able to complete
authentication and operate as a rogue AP.
This issue could only partially be mitigated.
The EAP-pwd implementation did't properly validate fragmentation
reassembly state when receiving an unexpected fragment. This could
have lead to a process crash due to a NULL pointer derefrence.
An attacker in radio range of a station or access point with EAP-pwd
support could cause a crash of the relevant process (wpa_supplicant
or hostapd), ensuring a denial of service.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your wpa packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148
GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31
mail: firstname.lastname@example.org, http://sunweavers.net
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