CVE-2017-1000112
Linux Kernel - UDP Fragmentation Offset 'UFO' Privilege Escalation
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
4Exploited in Wild
-Decision
Descriptions
Linux kernel: Exploitable memory corruption due to UFO to non-UFO path switch. When building a UFO packet with MSG_MORE __ip_append_data() calls ip_ufo_append_data() to append. However in between two send() calls, the append path can be switched from UFO to non-UFO one, which leads to a memory corruption. In case UFO packet lengths exceeds MTU, copy = maxfraglen - skb->len becomes negative on the non-UFO path and the branch to allocate new skb is taken. This triggers fragmentation and computation of fraggap = skb_prev->len - maxfraglen. Fraggap can exceed MTU, causing copy = datalen - transhdrlen - fraggap to become negative. Subsequently skb_copy_and_csum_bits() writes out-of-bounds. A similar issue is present in IPv6 code. The bug was introduced in e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") on Oct 18 2005.
Linux kernel: Existe una corrupción de memoria explotable debida al cambio de ruta de UFO a no UFO. Al crear un paquete UFO con MSG_MORE, __ip_append_data() llama a ip_ufo_append_data() para que se anexe. Sin embargo, entre dos llamadas send(), la ruta anexa puede cambiarse de UFO a no UFO, lo que lleva a una corrupción de memoria. Si la longitud del paquete UFO sobrepasa el MTU, copy = maxfraglen - skb->len se convierte en negativo en la ruta no UFO y se toma una rama para asignar un nuevo skb. Esto desencadena la fragmentación y el cálculo de fraggap = skb_prev->len - maxfraglen. fraggap puede exceder el MTU, lo que provoca que copy = datalen - transhdrlen - fraggap se vuelva negativo. En consecuencia, skb_copy_and_csum_bits() escribe fuera de límites. Existe un problema similar en el código IPv6. Este error fue introducido en e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach") el 18 de octubre de 2005.
An exploitable memory corruption flaw was found in the Linux kernel. The append path can be erroneously switched from UFO to non-UFO in ip_ufo_append_data() when building an UFO packet with MSG_MORE option. If unprivileged user namespaces are available, this flaw can be exploited to gain root privileges.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2017-08-10 CVE Published
- 2017-08-13 First Exploit
- 2017-10-03 CVE Reserved
- 2023-07-08 EPSS Updated
- 2024-08-05 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-122: Heap-based Buffer Overflow
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (18)
| URL | Tag | Source |
|---|---|---|
| http://www.securityfocus.com/bid/100262 | Third Party Advisory | |
| http://www.securitytracker.com/id/1039162 | Third Party Advisory | |
| https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-1000112 | Third Party Advisory |
| URL | Date | SRC |
|---|---|---|
| https://www.exploit-db.com/exploits/45147 | 2024-08-05 | |
| https://www.exploit-db.com/exploits/47169 | 2018-12-29 | |
| https://www.exploit-db.com/exploits/43418 | 2017-08-13 | |
| https://github.com/ol0273st-s/CVE-2017-1000112-Adpated | 2020-02-14 |
| URL | Date | SRC |
|---|---|---|
| http://seclists.org/oss-sec/2017/q3/277 | 2023-06-07 |
| URL | Date | SRC |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3981 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2017:2918 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2017:2930 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2017:2931 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2017:3200 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2019:1931 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2019:1932 | 2023-06-07 | |
| https://access.redhat.com/errata/RHSA-2019:4159 | 2023-06-07 | |
| https://access.redhat.com/security/cve/CVE-2017-1000112 | 2019-12-10 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1479307 | 2019-12-10 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.15 < 3.10.108 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.15 < 3.10.108" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.11 < 3.16.47 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.11 < 3.16.47" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.17 < 3.18.65 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.17 < 3.18.65" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.19 < 4.4.82 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.19 < 4.4.82" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.5 < 4.9.43 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.5 < 4.9.43" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.10 < 4.12.7 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.10 < 4.12.7" | - |
Affected
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