Squid-Cache Squid vulnerabilities

CVE-2020-11945 [CRITICAL] CWE-190 CVE-2020-11945: An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authent An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead o

CVE-2019-12524 [CRITICAL] CWE-306 CVE-2019-12524: An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its ru An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to see if the request should be denied. Squid by default comes with rules to block access to the Cache Manager, which serves detailed server information meant for the maintainer. This rule is implemented via url_regex. The handler for url_regex

CVE-2019-12519 [CRITICAL] CWE-787 CVE-2019-12519: An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Sq An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When addin

CVE-2019-12520 [HIGH] CWE-20 CVE-2019-12520: An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request. If found, it servers the request. The absolute URL can include the decoded UserInfo (username and password) for certain protocols. This decoded i

CVE-2019-12521 [MEDIUM] CWE-193 CVE-2019-12521: An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements i An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Hea

CVE-2019-12522 [MEDIUM] CWE-269 CVE-2019-12522: An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child process An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.

CVE-2019-18860 [MEDIUM] CWE-74 CVE-2019-18860: Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) par Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.

CVE-2019-12528 [HIGH] CVE-2019-12528: An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure o An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of sensitive information from heap memory, such as information associated with other users' sessions or non-Squid processes.

CVE-2020-8517 [HIGH] CWE-20 CVE-2020-8517: An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentica An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating

CVE-2020-8449 [HIGH] CWE-668 CVE-2020-8449: An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret cr An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

CVE-2020-8450 [HIGH] CWE-131 CVE-2020-8450: An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client ca An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.

CVE-2019-12523 [CRITICAL] CVE-2019-12523: An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP reque An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only lis

CVE-2019-12526 [CRITICAL] CWE-787 CVE-2019-12526: An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-base An issue was discovered in Squid before 4.9. URN response handling in Squid suffers from a heap-based buffer overflow. When receiving data from a remote server in response to an URN request, Squid fails to ensure that the response can fit within the buffer. This leads to attacker controlled data overflowing in the heap.

CVE-2019-18679 [HIGH] CWE-200 CVE-2019-18679: An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating

CVE-2019-18676 [HIGH] CWE-787 CVE-2019-18676: An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there i An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform

CVE-2019-18677 [MEDIUM] CWE-352 CVE-2019-18677: An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (bec An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

CVE-2019-18678 [MEDIUM] CWE-444 CVE-2019-18678: An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP reques An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to

CVE-2019-12854 [HIGH] CVE-2019-12854: Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memor Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memory. On systems with memory access protections, this can cause the CGI process to terminate unexpectedly, resulting in a denial of service for all clients using it.

CVE-2019-12525 [CRITICAL] CWE-787 CVE-2019-12525: An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length m

CVE-2019-12527 [HIGH] CWE-787 CVE-2019-12527: An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHea An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. Squid does not check that the decoded length isn't greater than the buffer, leading to a heap-based buffer overflow with user controlled data.