CVE-2020-17437 Memory corruption in n/a

What is CVE-2020-17437?

CVE-2020-17437 is a high-severity memory corruption vulnerability in n/a, published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by calculating the offset at which the normal data should be present in the global buffer. However, the length of this offset is not checked; therefore, for large values of the Urgent pointer bytes, the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.

Weakness: CWE-787

Which versions are affected by CVE-2020-17437?

It affects 11 products.

Products include Open-Iscsi Project Open-Iscsi, Siemens Sentron 3va Com100 Firmware, Siemens Sentron 3va Com800 Firmware, Siemens Sentron 3va Dsp800 Firmware, Siemens Sentron Pac2200 Clp Firmware, Siemens Sentron Pac2200 Firmware and 5 more.

How do I fix CVE-2020-17437?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-17437 being exploited?

There is no known exploitation of CVE-2020-17437 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-17840 Memory corruption in n/a High 7.8
• CVE-2020-13987 Information disclosure in n/a High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-17437, GHSA-cfgh-w4j7-hfhp, OESA-2022-1757, SUSE-SU-2022:2861-1, UBUNTU-CVE-2020-17437.