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Debian Security Advisory DSA 3395-1 (krb5 - security update)

Information

Severity

Severity

High

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.1

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

7 months ago

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Summary

Several vulnerabilities were discovered in krb5, the MIT implementation of Kerberos. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2015-2695 It was discovered that applications which call gss_inquire_context() on a partially-established SPNEGO context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash. CVE-2015-2696 It was discovered that applications which call gss_inquire_context() on a partially-established IAKERB context can cause the GSS-API library to read from a pointer using the wrong type, leading to a process crash. CVE-2015-2697 It was discovered that the build_principal_va() function incorrectly handles input strings. An authenticated attacker can take advantage of this flaw to cause a KDC to crash using a TGS request with a large realm field beginning with a null byte.

Affected Software

Affected Software

krb5 on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For the oldstable distribution (wheezy), these problems have been fixed in version 1.10.1+dfsg-5+deb7u4. For the stable distribution (jessie), these problems have been fixed in version 1.12.1+dfsg-19+deb8u1. For the testing distribution (stretch), these problems have been fixed in version 1.13.2+dfsg-3. For the unstable distribution (sid), these problems have been fixed in version 1.13.2+dfsg-3. We recommend that you upgrade your krb5 packages.

Common Vulnerabilities and Exposures (CVE)

References

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1. Download Multipass

sudo snap install multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

3. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. If you don’t have it already, install Brew. Then, to install Multipass simply execute:

brew install --cask multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

2. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. Download the installer for Windows

Note: You need Windows 10 Pro/Enterprise/Education v 1803 or later, or any Windows 10 with VirtualBox

2. Ensure your network is private

Make sure your local network is designated as private, otherwise Windows prevents Multipass from starting.

3. Run the installer

You need to allow the installer to gain Administrator privileges.

4. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04

5. Log into the multipass instance

multipass shell mageni

6. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash