Exploitalert - Database of Exploits

arc insecure temporary file creation

CVE	Category	Price	Severity
CVE-2021-12345	CWE-377	$500	High

Author	Risk	Exploitation Type	Date
John Doe	Critical	Local	2005-10-05

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2005090009

######################################################### arc insecure temporary file creation Vendor: http://arc.sourceforge.net/ Advisory: http://www.zataz.net/adviso/arc-09052005.txt Vendor informed: yes Exploit available: yes Impact : low Exploitation : low ######################################################### The vulnerability is caused due to temporary file being created insecurely. The temporary file used for archive creation could be read by untrusted users. Secunia has reported that D1g1t4lLeech has discovered this bug the 2005-09-16. ZATAZ Audit has discovered this bug the 2005-09-05 D1g1t4lLeech you are a true Leecher ;) ########## Versions: ########## arc <= 5.21j ########## Solution: ########## No solutions ######### Timeline: ######### Discovered : 2005-09-05 Vendor notified : no time to report (Leech powa) Vendor response : no reponse Vendor fix : no patch Vendor Sec report (vendor-sec (at) lst (dot) de [email concealed]) : Disclosure : 2005-09-19 ##################### Technical details : ##################### Vulnerable code : ----------------- In arc.c : 210 /* see where temp files go */ 211 #if !_MTS 212 arctemp = calloc(1, STRLEN); 213 if (!(arctemp2 = envfind("ARCTEMP"))) 214 arctemp2 = envfind("TMPDIR"); 215 if (arctemp2) { 216 strcpy(arctemp, arctemp2); 217 n = strlen(arctemp); 218 if (arctemp[n - 1] != CUTOFF) 219 arctemp[n] = CUTOFF; 220 } 221 #if UNIX 222 else strcpy(arctemp, "/tmp/"); 223 #endif 224 #if !MSDOS 225 { 226 static char tempname[] = "AXXXXXX"; 227 strcat(arctemp, mktemp(tempname)); 228 } 229 #else 230 strcat(arctemp, "$ARCTEMP"); 231 #endif 232 #else 233 guinfo("SHFSEP ", gotinf); 234 sepchr[0] = gotinf[0]; 235 guinfo("SCRFCHAR", gotinf); 236 tmpchr[0] = gotinf[0]; 237 arctemp = "-$$$"; 238 arctemp[0] = tmpchr[0]; 239 #endif 240 arctemp2 = NULL; 241 242 #if !UNIX 243 /* avoid any case problems with arguments */ 244 245 for (n = 1; n < num; n++) /* for each argument */ 246 upper(arg[n]); /* convert it to uppercase */ 247 #else 248 /* avoid case problems with command options */ 249 upper(arg[1]); /* convert to uppercase */ 250 #endif 251 252 /* create archive names, supplying defaults */ 253 #if UNIX 254 if (!stat(arg[2],&sbuf)) { 255 if ((sbuf.st_mode & S_IFMT) == S_IFDIR) 256 makefnam(arg[2],".arc",arcname); 257 else 258 strcpy(arcname,arg[2]); 259 } else 260 makefnam(arg[2],".arc",arcname); 261 #else 262 makefnam(arg[2], ".ARC", arcname); 263 #endif Take a look on a the right off temporary files in /tmp : -rw-r--r-- 1 root root 1564 Sep 5 10:28 A3C6Zs4.arc The file should not be world readable. The same problem for marc.c ######### Related : ######### Bug report : CVE : ##################### Credits : ##################### Eric Romang (eromang (at) zataz (dot) net [email concealed] - ZATAZ Audit) Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, Koon, etc.)

Impressum