Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS breakdown
Affected products
- F5 / NGINX Open Source1.31.0 – 1.31.1
- F5 / NGINX Open Source1.30.0 – 1.30.2
- F5 / NGINX Open Source0.1.17 – 0.9.7
- F5 / NGINX Plus37.0 – 37.0.1.1
- F5 / NGINX PlusR36 – R36 P5
- F5 / NGINX PlusR32 – R32 P7