RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1607078 - CVE-2018-10935 389-ds-base: ldapsearch with server side sort crashes the ldap server [rhel-7.6]
Summary: CVE-2018-10935 389-ds-base: ldapsearch with server side sort crashes the ldap...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: 389-ds-base
Version: 7.5
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: mreynolds
QA Contact: RHDS QE
URL:
Whiteboard:
Depends On:
Blocks: CVE-2018-10935
TreeView+ depends on / blocked
 
Reported: 2018-07-21 14:45 UTC by bob.yal
Modified: 2021-01-08 09:31 UTC (History)
9 users (show)

Fixed In Version: 389-ds-base-1.3.8.4-10.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1614861 (view as bug list)
Environment:
Last Closed: 2018-10-30 10:15:00 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github 389ds 389-ds-base issues 2949 0 None closed ldapsearch with server side sort crashes the ldap server 2020-09-29 04:14:26 UTC
Red Hat Product Errata RHSA-2018:3127 0 None None None 2018-10-30 10:16:12 UTC

Description bob.yal 2018-07-21 14:45:43 UTC 
Description of problem:
Any authenticated user doing a search using ldapsearch with extended controls for 
server side sorting is bringing down the ldap server itself.

Version-Release number of selected component (if applicable):
389-ds-base-1.3.7.5-18.el7.x86_64.rpm

How reproducible:
- Always reproduciable


Steps to Reproduce:
- Just install the rpm with some sample data
- Run the below ldapsearch
ldapsearch -D"cn=Directory Manager" -W -E sss=uid:2.5.13.3

Actual results:
# ldapsearch -D"cn=Directory Manager" -W -E sss=uid:2.5.13.3 > /dev/null
Enter LDAP Password:
ldap_result: Can't contact LDAP server (-1)
#

- System logs show the server is no longer responding
Jul 21 14:33:37 ipa-lab-vm-01 ns-slapd: [21/Jul/2018:14:33:37.566302429 +0000] - WARN - default_mr_indexer_create - Plugin [caseExactIA5Match] does not handle 2.5.13.3
Jul 21 14:33:37 ipa-lab-vm-01 ns-slapd: [21/Jul/2018:14:33:37.571733926 +0000] - WARN - default_mr_indexer_create - Plugin [caseIgnoreIA5Match] does not handle 2.5.13.3
Jul 21 14:33:38 ipa-lab-vm-01 kernel: ns-slapd[31886]: segfault at 0 ip 00007f301a986d5d sp 00007f2fd38057b0 error 4 in libback-ldbm.so[7f301a90d000+a0000]
Jul 21 14:33:38 ipa-lab-vm-01 systemd: dirsrv: main process exited, code=killed, status=11/SEGV
Jul 21 14:33:38 ipa-lab-vm-01 systemd: Unit dirsrv entered failed state.
Jul 21 14:33:38 ipa-lab-vm-01 systemd: dirsrv failed.


Expected results:
- If the ldapserver can not provide extended controls, it should through error, but should not crash
- This issue is allowing any authenticated user to bring down the server, by just running a query


Additional info:
Comment 2 mreynolds 2018-08-02 19:16:49 UTC 
I can not reproduce this on any version of DS (1.3.7, 1.3.8, and 1.4.0) based on the bug description.  Please provide exact steps to reproduce the issue.
Comment 3 Viktor Ashirov 2018-08-02 20:39:04 UTC 
Mark, I can reproduce this in IPA context (default install) with 389-ds-base-1.3.8.4-5.el7.x86_64:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fa1e064f700 (LWP 30759)]
attr_value_lowest (values=0x0, compare_fn=compare_fn@entry=0x7fa206367490 <slapi_berval_cmp>) at ldap/servers/slapd/back-ldbm/sort.c:421
421         struct berval *lowest_so_far = values[0];
(gdb) bt
#0  0x00007fa1f7ff3b0d in attr_value_lowest (values=0x0, compare_fn=compare_fn@entry=0x7fa206367490 <slapi_berval_cmp>) at ldap/servers/slapd/back-ldbm/sort.c:421
#1  0x00007fa1f7ff3b72 in sort_attr_compare (value_a=<optimized out>, value_b=0x0, compare_fn=0x7fa206367490 <slapi_berval_cmp>) at ldap/servers/slapd/back-ldbm/sort.c:444
#2  0x00007fa1f7ff3ca7 in compare_entries_sv (id_a=id_a@entry=0x55adbd44561c, id_b=id_b@entry=0x55adbd445618, s=s@entry=0x55adbef883c0, error=error@entry=0x7fa1e0649b3c, bc=<optimized out>, bc=<optimized out>) at ldap/servers/slapd/back-ldbm/sort.c:556
#3  0x00007fa1f7ff4228 in shortsort (s=0x55adbef883c0, hi=0x55adbd445624, lo=0x55adbd445618, bc=0x7fa1e0649d80) at ldap/servers/slapd/back-ldbm/sort.c:828
#4  0x00007fa1f7ff4228 in slapd_qsort (bc=bc@entry=0x7fa1e0649d80, list=list@entry=0x55adbd445600, s=s@entry=0x55adbef883c0) at ldap/servers/slapd/back-ldbm/sort.c:689
#5  0x00007fa1f7ff4440 in sort_candidates (be=0x55adbd351e10, lookthrough_limit=lookthrough_limit@entry=-1, expire_time=expire_time@entry=0x7fa1e0649f00, pb=pb@entry=0x55adbe787f20, candidates=0x55adbd445600, s=0x55adbef883c0, sort_error_type=sort_error_type@entry=0x7fa1e0649ed8) at ldap/servers/slapd/back-ldbm/sort.c:197
#6  0x00007fa1f7fe4bed in ldbm_back_search (pb=0x55adbe787f20) at ldap/servers/slapd/back-ldbm/ldbm_search.c:705
#7  0x00007fa20635bf42 in op_shared_search (pb=pb@entry=0x55adbe787f20, send_result=send_result@entry=1) at ldap/servers/slapd/opshared.c:763
#8  0x000055adbb88383e in do_search (pb=pb@entry=0x55adbe787f20) at ldap/servers/slapd/search.c:335
#9  0x000055adbb8716aa in connection_dispatch_operation (pb=0x55adbe787f20, op=0x55adbee9a1c0, conn=0x55adbe81f000) at ldap/servers/slapd/connection.c:649
#10 0x000055adbb8716aa in connection_threadmain () at ldap/servers/slapd/connection.c:1785
#11 0x00007fa20413dbab in _pt_root (arg=0x55adbe7b9320) at ../../../nspr/pr/src/pthreads/ptthread.c:201
#12 0x00007fa203adddd5 in start_thread (arg=0x7fa1e064f700) at pthread_create.c:307
#13 0x00007fa203189ead in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Comment 6 mreynolds 2018-08-06 19:17:57 UTC 
Upstream ticket:
https://pagure.io/389-ds-base/issue/49890
Comment 8 Sam Fowler 2018-08-08 01:40:16 UTC 
Security flaw bug: BZ#1613606
Comment 15 Viktor Ashirov 2018-08-12 21:14:38 UTC 
Build tested: 389-ds-base-1.3.8.4-10.el7.x86_64

[1] Search no longer crashes the server, but it doesn't return sorted results per matching rule

[root@server ds]# ldapsearch -xLLL -D cn=Directory\ Manager -w Secret123 -b cn=users,cn=accounts,dc=ipa,dc=test -E sss=uid:2.5.13.3 "(uid=tuser*)" uid | grep uid:
uid: tuser2
uid: tuser3
uid: tuser
[root@server ds]# ldapsearch -xLLL -D cn=Directory\ Manager -w Secret123 -b cn=users,cn=accounts,dc=ipa,dc=test -E sss=-uid:2.5.13.3 "(uid=tuser*)" uid | grep uid:
uid: tuser2
uid: tuser3
uid: tuser


[2] Although regular server side sort without matching rule works:

[root@server ds]# ldapsearch -xLLL -D cn=Directory\ Manager -w Secret123 -b cn=users,cn=accounts,dc=ipa,dc=test -E sss=-uid "(uid=tuser*)" uid | grep uid:
uid: tuser3
uid: tuser2
uid: tuser
[root@server ds]# ldapsearch -xLLL -D cn=Directory\ Manager -w Secret123 -b cn=users,cn=accounts,dc=ipa,dc=test -E sss=uid "(uid=tuser*)" uid | grep uid:
uid: tuser
uid: tuser2
uid: tuser3

I'll open a separate bugzilla for [1].

Since search no longer crashes the server, marking as VERIFIED.
Comment 17 errata-xmlrpc 2018-10-30 10:15:00 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:3127
Note You need to log in before you can comment on or make changes to this bug.