CVE-2011-0721

Publication date 15 February 2011

Last updated 24 July 2024

Ubuntu priority

Multiple CRLF injection vulnerabilities in (1) chfn and (2) chsh in shadow 1:4.1.4 allow local users to add new users or groups to /etc/passwd via the GECOS field.

From the Ubuntu Security Team

Kees Cook discovered that some shadow utilities did not correctly validate user input. A local attacker could exploit this flaw to inject newlines into the /etc/passwd file. If the system was configured to use NIS, this could lead to existing NIS groups or users gaining or losing access to the system, resulting in a denial of service or unauthorized access.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
shadow	10.10 maverick	Fixed 1:4.1.4.2-1ubuntu3.2
	10.04 LTS lucid	Fixed 1:4.1.4.2-1ubuntu2.2
	9.10 karmic	Fixed 1:4.1.4.1-1ubuntu2.2
	8.04 LTS hardy	Not affected
	6.06 LTS dapper	Not affected

Notes

kees

introduce in the upstream 4.1.2 changes https://alioth.debian.org/scm/viewvc.php?view=rev&root=pkg-shadow&revision=1978

CVE-2011-0721

From the Ubuntu Security Team

Status

Notes

kees

References

Related Ubuntu Security Notices (USN)

Other references