oss-security - Use after free in syslog-ng / affile_dw

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [day] [month] [year] [list]

Date: Sun, 23 Dec 2018 08:57:04 +0100
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Subject: Use after free in syslog-ng / affile_dw_reap()

Hi,

The recently released syslog-ng 3.19.1 fixes a use after free bug.

ASAN error:
==7538==ERROR: AddressSanitizer: heap-use-after-free on address 0x612000007770 at pc 0x7fc3a89069c8 bp 0x7ffd8099afd0 sp 0x7ffd8099afc0
READ of size 8 at 0x612000007770 thread T0
    #0 0x7fc3a89069c7 in affile_dw_reap modules/affile/affile-dest.c:140
    #1 0x7fc3ac21f563 in iv_run_timers /var/tmp/portage/dev-libs/ivykis-0.42.3-r1/work/ivykis-0.42.3/src/iv_timer.c:119
    #2 0x7fc3ac22703f in iv_main /var/tmp/portage/dev-libs/ivykis-0.42.3-r1/work/ivykis-0.42.3/src/iv_main_posix.c:98
    #3 0x7fc3adf1e6d4 in main_loop_run lib/mainloop.c:580
    #4 0x401ef7 in main syslog-ng/main.c:307
    #5 0x7fc3ad45fb9d in __libc_start_main (/lib64/libc.so.6+0x21b9d)
    #6 0x4021b9 in _start (/usr/sbin/syslog-ng+0x4021b9)


I reported this a while ago [1] and learned that this was already known
and fixed, but not released yet [2].


[1] https://github.com/balabit/syslog-ng/issues/2454
[2] https://github.com/balabit/syslog-ng/pull/2418

-- 
Hanno Böck
https://hboeck.de/

mail/jabber: hanno@...eck.de
GPG: FE73757FA60E4E21B937579FA5880072BBB51E42

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.