In the Linux kernel, the following vulnerability has been resolved:
ipvs: fix integer overflow in ftp helper port/address parsing
ip_vs_ftp_get_addrport() accumulates decimal digits into a __u16
(hport) and into unsigned char (p[]) without checking for overflow. A crafted FTP PASV/EPSV response with an over-long port or address
octet wraps the value, so the helper configures the data connection
with a truncated port/address. The netfilter conntrack FTP helper had the same defect, fixed in
commit 2b413fc689ba ("netfilter: nf_conntrack_ftp: avoid u16
overflows").
Apply the equivalent fix here: widen the port accumulator to u32 and reject values above 65535, and reject address octets above 255.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
References 8
https://git.kernel.org/stable/c/00bcc6d679262ea42688fba1d7819ea6e56f12ef
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4aed450adaee3a021db27be94c61fe025b0d05ff
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/50cb9b7263a2ed01f7d2f97818a800c2ee05f661
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b1908bff0faaa94d55be72da65879cad632e8236
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d02de9a7a7e2484da0cf37e50614840623b98a62
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/deaa88fa010ba0dfc554d09e006ddd1ce9945c82
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e625a9477d12baaff4025c5f9989184a907ea8fc
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fc1493c905d7e0bc8830c1d83915cb7831daf1a1
416baaa9-dc9f-4396-8d5f-8c081fb06d67