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From: "372091606 at qq dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug glob/30635] New: stack-overflow
 /build/glibc-SzIz7B/glibc-2.31/posix/../posix/glob.c:546:9 in glob64
Date: Fri, 14 Jul 2023 02:40:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30635

            Bug ID: 30635
           Summary: stack-overflow
                    /build/glibc-SzIz7B/glibc-2.31/posix/../posix/glob.c:5
                    46:9 in glob64
           Product: glibc
           Version: 2.31
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: glob
          Assignee: unassigned at sourceware dot org
          Reporter: 372091606 at qq dot com
  Target Milestone: ---

Created attachment 14963
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14963&action=3Ded=
it
The poc and ASAN report of glob stack-buffer-overflow

When I was fuzzing the logrotate program, I discovered a glob stack overflow
vulnerability, details of which can be seen in the 0x02 section of the link
below:

https://github.com/logrotate/logrotate/issues/533

Poc 0x02 seems to be an issue in the glob(3) implementation of glibc, since=
 the
man page does not mention any limitations on the supported input or offers a
flag for secure operations on user controlled input.=20

Reproduction steps are as follows:

```
$ git clone https://github.com/logrotate/logrotate

$ cd logrotate

$ CC=3Dclang CXX=3Dclang++ CFLAGS=3D"-g -fsanitize=3Daddress -fno-omit-fram=
e-pointer"
CXXFLAGS=3D"-g -fsanitize=3Daddress -fno-omit-frame-pointer" ./configure

$ make

$ ./logrotate -d ./poc2_stack_overflow=20
```

```
$ ls -al /lib/x86_64-linux-gnu/libc.so.6=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
lrwxrwxrwx 1 root root  /lib/x86_64-linux-gnu/libc.so.6 -> libc-2.31.so
```

--=20
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