Описание
Security update for squid3
This update for squid3 fixes the following issues:
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Fixed a Cache Poisoning and Request Smuggling attack (CVE-2020-15049, bsc#1173455)
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Fixed incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (CVE-2019-12519, CVE-2019-12521, bsc#1169659)
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Fixed handling of hostname in cachemgr.cgi (CVE-2019-18860, bsc#1167373)
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Fixed a potential remote execution vulnerability when using HTTP Digest Authentication (CVE-2020-11945, bsc#1170313)
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Fixed a potential ACL bypass, cache-bypass and cross-site scripting attack when processing invalid HTTP Request messages (CVE-2019-12520, CVE-2019-12524, bsc#1170423)
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Fixed a potential denial of service when processing TLS certificates during HTTPS connections (CVE-2020-14059, bsc#1173304)
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Fixed a potential denial of service associated with incorrect buffer management of HTTP Basic Authentication credentials (bsc#1141329, CVE-2019-12529)
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Fixed an incorrect buffer management resulting in vulnerability to a denial of service during processing of HTTP Digest Authentication credentials (bsc#1141332, CVE-2019-12525)
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Fix XSS via user_name or auth parameter in cachemgr.cgi (bsc#1140738, CVE-2019-13345)
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Fixed a potential code execution vulnerability (CVE-2019-12526, bsc#1156326)
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Fixed HTTP Request Splitting in HTTP message processing and information disclosure in HTTP Digest Authentication (CVE-2019-18678, CVE-2019-18679, bsc#1156323, bsc#1156324)
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Fixed a security issue allowing a remote client ability to cause use a buffer overflow when squid is acting as reverse-proxy. (CVE-2020-8449, CVE-2020-8450, bsc#1162687)
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Fixed a security issue allowing for information disclosure in FTP gateway (CVE-2019-12528, bsc#1162689)
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Fixed a security issue in ext_lm_group_acl when processing NTLM Authentication credentials. (CVE-2020-8517, bsc#1162691)
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Fixed Cross-Site Request Forgery in HTTP Request processing (CVE-2019-18677, bsc#1156328)
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Disable urn parsing and parsing of unknown schemes (bsc#1156329, CVE-2019-12523, CVE-2019-18676)
Список пакетов
SUSE Linux Enterprise Point of Sale 11 SP3
SUSE Linux Enterprise Server 11 SP4-LTSS
Ссылки
- Link for SUSE-SU-2020:14460-1
- E-Mail link for SUSE-SU-2020:14460-1
- SUSE Security Ratings
- SUSE Bug 1140738
- SUSE Bug 1141329
- SUSE Bug 1141332
- SUSE Bug 1156323
- SUSE Bug 1156324
- SUSE Bug 1156326
- SUSE Bug 1156328
- SUSE Bug 1156329
- SUSE Bug 1162687
- SUSE Bug 1162689
- SUSE Bug 1162691
- SUSE Bug 1167373
- SUSE Bug 1169659
- SUSE Bug 1170313
- SUSE Bug 1170423
- SUSE Bug 1173304
- SUSE Bug 1173455
Описание
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 adding a new member, there is no check to ensure that the stack won't overflow.
Затронутые продукты
Ссылки
- CVE-2019-12519
- SUSE Bug 1169659
Описание
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 info is prepended to the domain. This allows an attacker to provide a username that has special characters to delimit the domain, and treat the rest of the URL as a path or query string. An attacker could first make a request to their domain using an encoded username, then when a request for the target domain comes in that decodes to the exact URL, it will serve the attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows an attacker to gain access to features that only reverse proxies can use, such as ESI.
Затронутые продукты
Ссылки
- CVE-2019-12520
- SUSE Bug 1169666
- SUSE Bug 1170423
Описание
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 Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
Затронутые продукты
Ссылки
- CVE-2019-12521
- SUSE Bug 1169659
Описание
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 listen on localhost.
Затронутые продукты
Ссылки
- CVE-2019-12523
- SUSE Bug 1156329
- SUSE Bug 1165586
Описание
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 rules URL decodes an incoming request. This allows an attacker to encode their URL to bypass the url_regex check, and gain access to the blocked resource.
Затронутые продукты
Ссылки
- CVE-2019-12524
- SUSE Bug 1169666
- SUSE Bug 1170423
Описание
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 minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
Затронутые продукты
Ссылки
- CVE-2019-12525
- SUSE Bug 1141332
Описание
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.
Затронутые продукты
Ссылки
- CVE-2019-12526
- SUSE Bug 1156326
Описание
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.
Затронутые продукты
Ссылки
- CVE-2019-12528
- SUSE Bug 1162689
Описание
An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.
Затронутые продукты
Ссылки
- CVE-2019-12529
- SUSE Bug 1141329
Описание
The cachemgr.cgi web module of Squid through 4.7 has XSS via the user_name or auth parameter.
Затронутые продукты
Ссылки
- CVE-2019-13345
- SUSE Bug 1140738
Описание
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 the attack via a crafted URI scheme.
Затронутые продукты
Ссылки
- CVE-2019-18676
- SUSE Bug 1156329
- SUSE Bug 1165586
Описание
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.
Затронутые продукты
Ссылки
- CVE-2019-18677
- SUSE Bug 1156328
Описание
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 software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.
Затронутые продукты
Ссылки
- CVE-2019-18678
- SUSE Bug 1156323
Описание
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 memory areas to target for remote code execution attacks.
Затронутые продукты
Ссылки
- CVE-2019-18679
- SUSE Bug 1156324
Описание
Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.
Затронутые продукты
Ссылки
- CVE-2019-18860
- SUSE Bug 1167373
Описание
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 of replayed as valid credentials).
Затронутые продукты
Ссылки
- CVE-2020-11945
- SUSE Bug 1170313
Описание
An issue was discovered in Squid 5.x before 5.0.3. Due to an Incorrect Synchronization, a Denial of Service can occur when processing objects in an SMP cache because of an Ipc::Mem::PageStack::pop ABA problem during access to the memory page/slot management list.
Затронутые продукты
Ссылки
- CVE-2020-14059
- SUSE Bug 1173303
- SUSE Bug 1173304
Описание
An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.
Затронутые продукты
Ссылки
- CVE-2020-15049
- SUSE Bug 1173455
- SUSE Bug 1174381
Описание
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.
Затронутые продукты
Ссылки
- CVE-2020-8449
- SUSE Bug 1162687
Описание
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.
Затронутые продукты
Ссылки
- CVE-2020-8450
- SUSE Bug 1162687
Описание
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 and a denial of service for all clients using the proxy.
Затронутые продукты
Ссылки
- CVE-2020-8517
- SUSE Bug 1162691