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Debian Security Advisory 2557-1

Debian Security Advisory 2557-1
Posted Oct 8, 2012
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2557-1 - Timo Warns discovered that the internal authentication server of hostapd, a user space IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP Authenticator, is vulnerable to a buffer overflow when processing fragmented EAP-TLS messages. As a result, an internal overflow checking routine terminates the process. An attacker can abuse this flaw to conduct denial of service attacks via crafted EAP-TLS messages prior to any authentication.

tags | advisory, denial of service, overflow
systems | linux, debian
advisories | CVE-2012-4445
MD5 | 3ad420a991bd274a94c20c7401d44706

Debian Security Advisory 2557-1

Change Mirror Download
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- -------------------------------------------------------------------------
Debian Security Advisory DSA-2557-1 security@debian.org
http://www.debian.org/security/ Nico Golde
October 08, 2012 http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : hostapd
Vulnerability : buffer overflow
Problem type : remote
Debian-specific: no
CVE ID : CVE-2012-4445

Timo Warns discovered that the internal authentication server of hostapd,
a user space IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP Authenticator,
is vulnerable to a buffer overflow when processing fragmented EAP-TLS
messages. As a result, an internal overflow checking routine terminates
the process. An attacker can abuse this flaw to conduct denial of service
attacks via crafted EAP-TLS messages prior to any authentication.

For the stable distribution (squeeze), this problem has been fixed in
version 0.6.10-2+squeeze1.

For the testing (wheezy) and unstable (sid) distributions, this problem
will be fixed soon.


We recommend that you upgrade your hostapd packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

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