apachetop insecure temporary file creation

2005.09.30
Risk: Low
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 2.1/10
Impact Subscore: 2.9/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

######################################################### apachetop insecure temporary file creation Vendor: http://clueful.shagged.org/apachetop/ Advisory: http://www.zataz.net/adviso/apachetop-09022005.txt Vendor informed: yes Exploit available: yes Impact : low Exploitation : low ######################################################### The vulnerability is caused due to temporary file being created insecurely. This can be exploited via symlink attacks in combination to create and overwrite arbitrary files with the privileges of the user running the affected script. ########## Versions: ########## apachetop <= 0.12.5 ########## Solution: ########## Apply : apachetop_CAN-2005-2660.patch Patch from Steve Kemp (Debian) http://bugs.gentoo.org/attachment.cgi?id=69342 ######### Timeline: ######### Discovered : 2005-09-02 Vendor notified : 2005-09-02 Vendor response : no reponse Vendor fix : no patch Vendor Sec report (vendor-sec (at) lst (dot) de [email concealed]) : 2005-09-13 Disclosure : 2005-09-30 ##################### Technical details : ##################### Vulnerable code : ----------------- ake a look at : src/apachetop.h 247 #define DEBUG_OUTPUT "/tmp/atop.debug" Then in : src/apachetop.cc 85 cf.debug = true; 1103 int dprintf(const char *fmt, ...) /* {{{ */ 1104 { 1105 FILE *d; 1106 va_list args; 1107 1108 if (cf.debug && (d = fopen(DEBUG_OUTPUT, "a"))) 1109 { 1110 va_start(args, fmt); 1111 vfprintf(d, fmt, args); 1112 fclose(d); 1113 va_end(args); 1114 } 1115 1116 return 0; 1117 } /* }}} */ ######### Related : ######### Bug report : http://bugs.gentoo.org/show_bug.cgi?id=104473 CVE : CAN-2005-2660 ##################### Credits : ##################### Eric Romang (eromang (at) zataz (dot) net [email concealed] - ZATAZ Audit) - Gentoo security scout Thxs to Gentoo Security Team.


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