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atlassianSecurity-metrics-botBSERV-13370
HistoryJul 05, 2022 - 9:01 p.m.

Bitbucket: Multiple Servlet Filter Vulnerabilities

2022-07-0521:01:45
security-metrics-bot
jira.atlassian.com
28

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.008 Low

EPSS

Percentile

80.9%

Multiple Servlet Filter vulnerabilities have been fixed in Bitbucket Server and Data Center. These vulnerabilities also affect other Atlassian products. For more information, refer to [Atlassian’s security advisory|https://confluence.atlassian.com/security/multiple-products-security-advisory-cve-2022-26136-cve-2022-26137-1141493031.html].
h3. Arbitrary Servlet Filter Bypass (CVE-2022-26136)

A remote, unauthenticated attacker can bypass Servlet Filters used by first and third party apps. The impact depends on which filters are used by each app, and how the filters are used. Atlassian has released updates that fix the root cause of this vulnerability, but has not exhaustively enumerated all potential consequences of this vulnerability. Only the following attacks have been confirmed:

{}Authentication bypass{}. Sending a specially crafted HTTP request can bypass custom Servlet Filters used by third party apps to enforce authentication. A remote, unauthenticated attacker can exploit this to bypass authentication used by third party apps. Please note Atlassian has confirmed this attack is possible, but has not determined a list of all affected apps.

{}Cross-site scripting (XSS){}. Sending a specially crafted HTTP request can bypass the Servlet Filter used to validate legitimate Atlassian Gadgets, which can result in XSS. An attacker that can trick a user into requesting a malicious URL can execute arbitrary Javascript in the user’s browser.
h3. Additional Servlet Filter Invocation (CVE-2022-26137)

A remote, unauthenticated attacker can cause additional Servlet Filters to be invoked when the application processes requests or responses. Atlassian has confirmed and fixed the only known security issue associated with this vulnerability:

{}Cross-origin resource sharing (CORS) bypass{}. Sending a specially crafted HTTP request can invoke the Servlet Filter used to respond to CORS requests, resulting in a CORS bypass. An attacker that can trick a user into requesting a malicious URL can access the vulnerable application with the victim’s permissions.
h3. Affected versions:

  • Versions < 7.6.16
  • All versions 7.7.x through 7.16.x
  • 7.17.x < 7.17.8
  • All versions 7.18.x
  • 7.19.x < 7.19.5
  • 7.20.x < 7.20.2
  • 7.21.x < 7.21.2
  • 8.0.0
  • 8.1.0

h3. Fixed versions:

h3. References

[Multiple Products Security Advisory 2022-07-20|https://confluence.atlassian.com/security/multiple-products-security-advisory-cve-2022-26136-cve-2022-26137-1141493031.html]

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.008 Low

EPSS

Percentile

80.9%

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