Bug 24333 - CVE-2010-3385: insecure library loading
Summary: CVE-2010-3385: insecure library loading
Status: CLOSED FIXED
Alias: None
Product: Sisyphus
Classification: Development
Component: tuxguitar (show other bugs)
Version: unstable
Hardware: all Linux
: P3 blocker
Assignee: ded@altlinux.org
QA Contact: qa-sisyphus
URL: http://bugs.debian.org/598307
Keywords: security
Depends on:
Blocks:
 
Reported: 2010-10-16 12:49 MSD by Vladimir Lettiev
Modified: 2011-10-12 03:17 MSK (History)
4 users (show)

See Also:


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Description Vladimir Lettiev 2010-10-16 12:49:07 MSD
The vulnerability is introduced by an insecure change to
LD_LIBRARY_PATH, and environment variable used by ld.so(8) to look for
libraries on a directory other than the standard paths.

Vulnerable code follows:

/usr/bin/tuxguitar line 129:
        export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$MOZILLA_FIVE_HOME"

When there's an empty item on the colon-separated list of
LD_LIBRARY_PATH, ld.so treats it as '.' (i.e. CWD/$PWD.)
If the given script is executed from a directory where a potential,
local, attacker can write files to, there's a chance to exploit this
bug.
Comment 1 Vitaly Lipatov 2010-10-16 13:34:19 MSD
Не понял, мне прислать патч для ld.so, чтобы он пустое поле не считал '.' ?
Comment 2 Vladimir Lettiev 2010-10-16 13:43:18 MSD
:)
Разговоры об этом идут давно, но ещё никто не смог протащить такое в апстрим.

Правильнее обернуть так:
export LD_LIBRARY_PATH="${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$MOZILLA_FIVE_HOME"
Comment 3 Vitaly Lipatov 2011-10-12 02:17:19 MSK
В данном скрипте LD_LIBRARY_PATH не может быть пустой из-за строки выше:
LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}/usr/lib/tuxguitar/
Comment 4 Repository Robot 2011-10-12 03:17:21 MSK
tuxguitar-1.2-alt2 -> sisyphus:

* Tue Oct 11 2011 Vitaly Lipatov <lav@altlinux> 1.2-alt2
- fix CVE-2010-3385: insecure library loading (ALT bug #24333)