Eric Dumazet

32 exploits Active since Feb 2013
CVE-2017-9242 WRITEUP MEDIUM WRITEUP
Linux Kernel < 4.11.3 - Denial of Service via __ip6_append_data Race Condition
The __ip6_append_data function in net/ipv6/ip6_output.c in the Linux kernel through 4.11.3 is too late in checking whether an overwrite of an skb data structure may occur, which allows local users to cause a denial of service (system crash) via crafted system calls.
CVSS 5.5
CVE-2019-10638 WRITEUP MEDIUM WRITEUP
Linux Kernel < 5.1.7 - Information Exposure via IP ID Hash Collision
In the Linux kernel before 5.1.7, a device can be tracked by an attacker using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). An attack may be conducted by hosting a crafted web page that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP addresses.
CVSS 6.5
CVE-2019-10639 WRITEUP HIGH WRITEUP
Linux kernel 4.1-4.20.9 - Information Exposure via IP ID Hash Collision
The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows Information Exposure (partial kernel address disclosure), leading to a KASLR bypass. Specifically, it is possible to extract the KASLR kernel image offset using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). This key contains enough bits from a kernel address (of a static variable) so when the key is extracted (via enumeration), the offset of the kernel image is exposed. This attack can be carried out remotely, by the attacker forcing the target device to send UDP or ICMP (or certain other) traffic to attacker-controlled IP addresses. Forcing a server to send UDP traffic is trivial if the server is a DNS server. ICMP traffic is trivial if the server answers ICMP Echo requests (ping). For client targets, if the target visits the attacker's web page, then WebRTC or gQUIC can be used to force UDP traffic to attacker-controlled IP addresses. NOTE: this attack against KASLR became viable in 4.1 because IP ID generation was changed to have a dependency on an address associated with a network namespace.
CVSS 7.5
CVE-2019-11479 WRITEUP HIGH WRITEUP
Linux Kernel 4.4-4.4.182 - Denial of Service via TCP MSS Fragmentation
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
CVSS 7.5
CVE-2019-20422 WRITEUP MEDIUM WRITEUP
Linux Kernel < 5.3.4 - Denial of Service via fib6_rule_lookup Reference Count Mishandling
In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.
CVSS 5.5
CVE-2019-5599 WRITEUP HIGH WRITEUP
FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6 - Denial of Service via RACK TCP Stack
In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service.
CVSS 7.5
CVE-2022-28356 WRITEUP MEDIUM WRITEUP
Linux kernel <5.17.1 - Info Disclosure
In the Linux kernel before 5.17.1, a refcount leak bug was found in net/llc/af_llc.c.
CVSS 5.5