USN-145-1: wget vulnerabilities
Posted on: 06/28/2005 09:23 AM

A wget security update is available for Ubuntu Linux

Ubuntu Security Notice USN-145-1 June 28, 2005
wget vulnerabilities
CAN-2004-1487, CAN-2004-1488, CAN-2004-2014

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog)
Ubuntu 5.04 (Hoary Hedgehog)

The following packages are affected:


The problem can be corrected by upgrading the affected package to version 1.9.1-4ubuntu0.1 (for Ubuntu 4.10), or 1.9.1-10ubuntu2.1 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow:

Jan Minar discovered a path traversal vulnerability in wget. If the name ".." was a valid host name (which can be achieved with a malicious or poisoned domain name server), it was possible to trick wget into creating downloaded files into arbitrary locations with arbitrary names. For example, wget could silently overwrite the users ~/.bashrc and other configuration files which are executed automatically. (CAN-2004-1487)

Jan Minar also discovered that wget printed HTTP response strings from the server to the terminal without any filtering. Malicious HTTP servers could exploit this to send arbitrary terminal sequences and strings which would then be executed and printed to the console. This could potentially lead to arbitrary code execution with the privileges of the user invoking wget. (CAN-2004-1488)

Hugo Vzquez Carams discovered a race condition when writing output files. After wget determined the output file name, but before the file was actually opened (the time window is determined by the delay of the first received data packet), a local attacker with with write permission to the download directory could create a symbolic link with the name of the output file. This could be exploited to overwrite arbitrary files with the permissions of the user invoking wget. (CAN-2004-2014)

Updated packages for Ubuntu 4.10 (Warty Warthog):

Source archives:
Size/MD5: 17337 d26d3048ef9dcc1a0c1eb935ebd31387
Size/MD5: 614 db27cc31fae83757f116680cc00b6bc1
Size/MD5: 1322378 e6051f1e1487ec0ebfdbda72bedc70ad

amd64 architecture (Athlon64, Opteron, EM64T Xeon)
Size/MD5: 439626 d98cd39c187b7c51160dc034542c7fa3

i386 architecture (x86 compatible Intel/AMD)
Size/MD5: 425400 01464aa874e60830377f93786731d5b9

powerpc architecture (Apple Macintosh G3/G4/G5)
Size/MD5: 432242 fd4ec089d03c29537b30f4d5f5ebdf1a

Updated packages for Ubuntu 5.04 (Hoary Hedgehog):

Source archives:
Size/MD5: 82218 35dd343f7e922b6775148106135664bf
Size/MD5: 624 b643f637455eb9bf3d7c186b54e297e5
Size/MD5: 1322378 e6051f1e1487ec0ebfdbda72bedc70ad

amd64 architecture (Athlon64, Opteron, EM64T Xeon)
Size/MD5: 211606 187a98a1be4918b96eabaef79f984b09

i386 architecture (x86 compatible Intel/AMD)
Size/MD5: 202350 8bce85f98e886eaf9bf213964e0b8e50

powerpc architecture (Apple Macintosh G3/G4/G5)
Size/MD5: 209098 4406b8a89a04b103d9d398798a11806b

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