Potential CVE-2021-26084 Exploitation Attempt

Status: test
Severity: high
Log source: category webserver
Author: Sittikorn S, Nuttakorn T
Source: github.com/SigmaHQ/sigma

Detects potential exploitation of CVE-2021-260841 a Confluence RCE using OGNL injection

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Rule body yaml

title: Potential CVE-2021-26084 Exploitation Attempt
id: 38825179-3c78-4fed-b222-2e2166b926b1
status: test
description: Detects potential exploitation of CVE-2021-260841 a Confluence RCE using OGNL injection
references:
    - https://github.com/TesterCC/exp_poc_library/blob/be61622600ec79d8fba2fa5f816a870715f0cb3b/exp_poc/CVE-2021-26084_Confluence_OGNL_injection/CVE-2021-26084.md
    - https://github.com/httpvoid/writeups/blob/62d3751945289d088ccfdf4d0ffbf61598a2cd7d/Confluence-RCE.md
    - https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html
    - https://mraddon.blog/2017/03/20/confluence-trick-to-create-pages-from-blueprint-templates/
author: Sittikorn S, Nuttakorn T
date: 2022-12-13
modified: 2023-03-24
tags:
    - attack.initial-access
    - attack.t1190
    - cve.2021-26084
    - detection.emerging-threats
logsource:
    category: webserver
    definition: 'Requirements: The POST request body data must be collected in order to make use of certain parts of this detection'
detection:
    selection_main:
        cs-method: 'POST'
        sc-status: 200
        cs-username: 'anonymous' # This string is used to reduce possible FP you could remove it to get authenticated attempts
    selection_exploit_1:
        cs-uri-query|contains|all:
            - '/pages/createpage-entervariables.action'
            - 'SpaceKey=x' # This URI assume that you can't have a space ID of "X"
    selection_exploit_2_uri:
        cs-uri-query|contains: '/doenterpagevariables.action'
    selection_exploit_2_keyword:
        - 'u0027' # This string should appear in the post body as a value of the parameter "queryString"
    condition: selection_main and (selection_exploit_1 or all of selection_exploit_2_*)
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection_main and (selection_exploit_1 or all of selection_exploit_2_*)

Stage 1: `selection_main`

selection_main:
    cs-method: 'POST'
    sc-status: 200
    cs-username: 'anonymous'

Stage 2: `selection_exploit_1`

selection_exploit_1:
    cs-uri-query|contains|all:
        - '/pages/createpage-entervariables.action'
        - 'SpaceKey=x'

Stage 3: `selection_exploit_2_uri`

selection_exploit_2_uri:
    cs-uri-query|contains: '/doenterpagevariables.action'

Stage 4: `selection_exploit_2_keyword`

selection_exploit_2_keyword:
    - 'u0027'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`cs-method`	eq	`POST`
`cs-uri-query`	match	`/doenterpagevariables.action` `/pages/createpage-entervariables.action` `SpaceKey=x`
`cs-username`	eq	`anonymous`
`sc-status`	eq	`200`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Potential CVE-2021-26084 Exploitation Attempt

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_main`

Stage 2: `selection_exploit_1`

Stage 3: `selection_exploit_2_uri`

Stage 4: `selection_exploit_2_keyword`

Indicators

Keyboard shortcuts

Search operators

Potential CVE-2021-26084 Exploitation Attempt

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_main

Stage 2: selection_exploit_1

Stage 3: selection_exploit_2_uri

Stage 4: selection_exploit_2_keyword

Indicators

Stage 0: `condition`

Stage 1: `selection_main`

Stage 2: `selection_exploit_1`

Stage 3: `selection_exploit_2_uri`

Stage 4: `selection_exploit_2_keyword`