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Ubuntu Security Notice USN-2449-1

Ubuntu Security Notice USN-2449-1
Posted Dec 22, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2449-1 - Neel Mehta discovered that NTP generated weak authentication keys. A remote attacker could possibly use this issue to brute force the authentication key and send requests if permitted by IP restrictions. Stephen Roettger discovered that NTP generated weak MD5 keys. A remote attacker could possibly use this issue to brute force the MD5 key and spoof a client or server. Stephen Roettger discovered that NTP contained buffer overflows in the crypto_recv(), ctl_putdata() and configure() functions. In non-default configurations, a remote attacker could use these issues to cause NTP to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. In addition, attackers would be isolated by the NTP AppArmor profile. Various other issues were also addressed.

tags | advisory, remote, denial of service, overflow, arbitrary, spoof
systems | linux, ubuntu
advisories | CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296
SHA-256 | 286111117445620d8391d69edda43445e28d24c84f9ba29db3f2c41c02f7041c

Ubuntu Security Notice USN-2449-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2449-1
December 22, 2014

ntp vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in NTP.

Software Description:
- ntp: Network Time Protocol daemon and utility programs

Details:

Neel Mehta discovered that NTP generated weak authentication keys. A remote
attacker could possibly use this issue to brute force the authentication
key and send requests if permitted by IP restrictions. (CVE-2014-9293)

Stephen Roettger discovered that NTP generated weak MD5 keys. A remote
attacker could possibly use this issue to brute force the MD5 key and spoof
a client or server. (CVE-2014-9294)

Stephen Roettger discovered that NTP contained buffer overflows in the
crypto_recv(), ctl_putdata() and configure() functions. In non-default
configurations, a remote attacker could use these issues to cause NTP to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service. In addition, attackers would be
isolated by the NTP AppArmor profile. (CVE-2014-9295)

Stephen Roettger discovered that NTP incorrectly continued processing when
handling certain errors. (CVE-2014-9296)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.10:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.10.1

Ubuntu 14.04 LTS:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.1

Ubuntu 12.04 LTS:
ntp 1:4.2.6.p3+dfsg-1ubuntu3.2

Ubuntu 10.04 LTS:
ntp 1:4.2.4p8+dfsg-1ubuntu2.2

After a standard system update you need to regenerate any MD5 keys that
were manually created with ntp-keygen.

References:
http://www.ubuntu.com/usn/usn-2449-1
CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296

Package Information:
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.10.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p3+dfsg-1ubuntu3.2
https://launchpad.net/ubuntu/+source/ntp/1:4.2.4p8+dfsg-1ubuntu2.2
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