CVE-2017-1000112
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.
- CVSS v3.1
- 7.0 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v2.0
- 6.9 MEDIUM
AV:L/AC:M/Au:N/C:C/I:C/A:C - EPSS
- 20.80% chance of exploitation in the next 30 days, 97th percentile
- Published
- 2017-10-04
- Updated
- 2024-08-05
Proof-of-concept exploits (7)
- IT19083124/SNP-Assignment1★ · 2020-05-12
- LucidOfficial/Linux-exploit-suggestor0★ · 2022-06-19
- amrelsadane123/Ecploit-kernel-4.10-linux-local1★ · 2019-12-25
- ol0273st-s/CVE-2017-1000112-Adpated1★ · 2020-02-14
- pradeepavula/Linux-Exploits-LES-0★ · 2024-02-25
- Spydomain/CVE-2017-1000112-PoC
- WhatsWrongAndWhy/CVE-2017-1000112
Metasploit modules (1)
ExploitDB entries (3)
- https://www.exploit-db.com/exploits/45147
- https://www.exploit-db.com/exploits/43418
- https://www.exploit-db.com/exploits/47169