CVE-2017-1000112

high · 7

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

20.8%

EPSS (exploit prob.)

97th

EPSS percentile

2017-10-05

Published

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-362

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 2.6.15, < 3.10.108
linux	linux_kernel	>= 3.11, < 3.16.47
linux	linux_kernel	>= 3.17, < 3.18.65
linux	linux_kernel	>= 3.19, < 4.4.82
linux	linux_kernel	>= 4.5, < 4.9.43
linux	linux_kernel	>= 4.10, < 4.12.7

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References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2017-1000112