Security Information / 2015 / Security Information -- DSA-3222-1 chrony

Debian Security Advisory

DSA-3222-1 chrony -- security update

Date Reported:

12 Apr 2015

Affected Packages:

chrony

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 782160.
In Mitre's CVE dictionary: CVE-2015-1821, CVE-2015-1822, CVE-2015-1853.

More information:

Miroslav Lichvar of Red Hat discovered multiple vulnerabilities in chrony, an alternative NTP client and server:

• CVE-2015-1821

  Using particular address/subnet pairs when configuring access control would cause an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

• CVE-2015-1822

  When allocating memory to save unacknowledged replies to authenticated command requests, a pointer would be left uninitialized, which could trigger an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

• CVE-2015-1853

  When peering with other NTP hosts using authenticated symmetric association, the internal state variables would be updated before the MAC of the NTP messages was validated. This could allow a remote attacker to cause a denial of service by impeding synchronization between NTP peers.

For the stable distribution (wheezy), these problems have been fixed in version 1.24-3.1+deb7u3.

For the unstable distribution (sid), these problems have been fixed in version 1.30-2.

We recommend that you upgrade your chrony packages.