Amazon Linux 2 Security Advisory: ALAS-2018-1135
Advisory Release Date: 2018-12-18 19:09 Pacific
Advisory Updated Date: 2018-12-19 17:46 Pacific
curl is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)(CVE-2018-14618)
Affected Packages:
curl
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update curl to update your system.
aarch64:
curl-7.55.1-12.amzn2.0.7.aarch64
libcurl-7.55.1-12.amzn2.0.7.aarch64
libcurl-devel-7.55.1-12.amzn2.0.7.aarch64
curl-debuginfo-7.55.1-12.amzn2.0.7.aarch64
i686:
curl-7.55.1-12.amzn2.0.7.i686
libcurl-7.55.1-12.amzn2.0.7.i686
libcurl-devel-7.55.1-12.amzn2.0.7.i686
curl-debuginfo-7.55.1-12.amzn2.0.7.i686
src:
curl-7.55.1-12.amzn2.0.7.src
x86_64:
curl-7.55.1-12.amzn2.0.7.x86_64
libcurl-7.55.1-12.amzn2.0.7.x86_64
libcurl-devel-7.55.1-12.amzn2.0.7.x86_64
curl-debuginfo-7.55.1-12.amzn2.0.7.x86_64