CVE-2007-0956 Auth bypass in n/a

What is CVE-2007-0956?

CVE-2007-0956 is a critical authentication bypass vulnerability in Canonical Ubuntu Linux, published on 6 Apr 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username beginning with a '-' character, a similar issue to CVE-2007-0882.

Weakness: CWE-306

Which versions are affected by CVE-2007-0956?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Mit Kerberos 5.

How do I fix CVE-2007-0956?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2007-0956 being exploited?

There is no known exploitation of CVE-2007-0956 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2007-0956, GHSA-gcgf-6qp7-hmmv.