Описание
Security update for squid
This update for squid fixes the following issues:
- CVE-2019-12519, CVE-2019-12521: fixes incorrect buffer handling that can result in cache poisoning, remote execution, and denial of service attacks when processing ESI responses (bsc#1169659).
- CVE-2020-11945: fixes a potential remote execution vulnerability when using HTTP Digest Authentication (bsc#1170313).
- CVE-2019-12520, CVE-2019-12524: fixes a potential ACL bypass, cache-bypass and cross-site scripting attack when processing invalid HTTP Request messages (bsc#1170423).
Список пакетов
HPE Helion OpenStack 8
SUSE Enterprise Storage 5
SUSE Linux Enterprise Server 12 SP2-BCL
SUSE Linux Enterprise Server 12 SP2-LTSS
SUSE Linux Enterprise Server 12 SP3-BCL
SUSE Linux Enterprise Server 12 SP3-LTSS
SUSE Linux Enterprise Server 12 SP4
SUSE Linux Enterprise Server for SAP Applications 12 SP2
SUSE Linux Enterprise Server for SAP Applications 12 SP3
SUSE Linux Enterprise Server for SAP Applications 12 SP4
SUSE OpenStack Cloud 7
SUSE OpenStack Cloud 8
SUSE OpenStack Cloud Crowbar 8
Ссылки
- Link for SUSE-SU-2020:1227-1
- E-Mail link for SUSE-SU-2020:1227-1
- SUSE Security Ratings
- SUSE Bug 1169659
- SUSE Bug 1170313
- SUSE Bug 1170423
- SUSE CVE CVE-2019-12519 page
- SUSE CVE CVE-2019-12520 page
- SUSE CVE CVE-2019-12521 page
- SUSE CVE CVE-2019-12524 page
- SUSE CVE CVE-2020-11945 page
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 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 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