7.5 - USN-984-1

Executive Summary

Summary
Title	LFTP vulnerability

Informations
Name	USN-984-1	First vendor Publication	2010-09-07
Vendor	Ubuntu	Last vendor Modification	2010-09-07
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Cvss Base Score	7.5	Attack Range	Network
Cvss Impact Score	6.4	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects the following Ubuntu releases:

Ubuntu 8.04 LTS Ubuntu 9.04 Ubuntu 9.10 Ubuntu 10.04 LTS

This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.

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

Ubuntu 8.04 LTS:
lftp 3.6.1-1ubuntu0.1

Ubuntu 9.04:
lftp 3.7.8-1ubuntu0.1

Ubuntu 9.10:
lftp 3.7.15-1ubuntu2.1

Ubuntu 10.04 LTS:
lftp 4.0.2-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

ATTENTION: This update changes previous behaviour by ignoring the filename supplied by servers in Content-Disposition headers. To re-enable previous behaviour, use the new xfer:auto-rename setting.

Details follow:

It was discovered that LFTP incorrectly filtered filenames suggested by Content-Disposition headers. If a user or automated system were tricked into downloading a file from a malicious site, a remote attacker could create the file with an arbitrary name, such as a dotfile, and possibly run arbitrary code.