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VPR Score: 6
SynopsisThe remote Debian host is missing a security update.
DescriptionA vulnerability was found in how WPA code can be triggered to reconfigure WPA/WPA2/RSN keys (TK, GTK, or IGTK) by replaying a specific frame that is used to manage the keys. Such reinstallation of the encryption key can result in two different types of vulnerabilities: disabling replay protection and significantly reducing the security of encryption to the point of allowing frames to be decrypted or some parts of the keys to be determined by an attacker depending on which cipher is used.
Those issues are commonly known under the 'KRACK' appelation.
According to US-CERT, 'the impact of exploiting these vulnerabilities includes decryption, packet replay, TCP connection hijacking, HTTP content injection, and others.'
Reinstallation of the pairwise encryption key (PTK-TK) in the 4-way handshake.
Reinstallation of the group key (GTK) in the 4-way handshake.
Reinstallation of the integrity group key (IGTK) in the 4-way handshake.
Reinstallation of the group key (GTK) in the group key handshake.
Reinstallation of the integrity group key (IGTK) in the group key handshake.
Accepting a retransmitted Fast BSS Transition (FT) Reassociation Request and reinstalling the pairwise encryption key (PTK-TK) while processing it.
Reinstallation of the STK key in the PeerKey handshake.
reinstallation of the Tunneled Direct-Link Setup (TDLS) PeerKey (TPK) key in the TDLS handshake.
reinstallation of the group key (GTK) when processing a Wireless Network Management (WNM) Sleep Mode Response frame.
reinstallation of the integrity group key (IGTK) when processing a Wireless Network Management (WNM) Sleep Mode Response frame.
For Debian 7 'Wheezy', these problems have been fixed in version 1.0-3+deb7u5. Note that the latter two vulnerabilities (CVE-2017-13087 and CVE-2017-13088) were mistakenly marked as fixed in the changelog whereas they simply did not apply to the 1.0 version of the WPA source code, which doesn't implement WNM sleep mode responses.
We recommend that you upgrade your wpa packages.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected packages.