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UPS: Observations on CVE-2015-3113, Prior Zero-Days and the Pirpi Payload…
CVE-2015-3113 KEVPublic exploit Critical · 9.8 EPSS 99.8%
Adobe Flash Player Heap-Based Buffer Overflow Vulnerability
Adobe · Flash Player
Summary
A heap-based buffer overflow in Adobe Flash Player affects versions before 13.0.0.296, 14.x through 18.x before 18.0.0.194 on Windows and OS X, and versions before 11.2.202.468 on Linux. An attacker who can get a victim to a location serving malicious content can execute arbitrary code, with no authentication, configuration, or additional user interaction required beyond the victim reaching that content.
Official description · NVD
Heap-based buffer overflow in Adobe Flash Player before 13.0.0.296 and 14.x through 18.x before 18.0.0.194 on Windows and OS X and before 11.2.202.468 on Linux allows remote attackers to execute arbitrary code via unspecified vectors, as exploited in the wild in June 2015.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
77.6 / 100
- Exploited
- Yes, in CISA KEV
- Reports
- 3
- Tactics
- 3/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited the day it was disclosed. Public exploit code (Metasploit) was available the same day.
- Named in a threat reportunit42.paloaltonetworks.com+6 yrs
- Added to CISA KEVEU database agrees+7 yrs
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
3 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 3Stealth
MITRE CTID mapping of the KEV entry · follow-on activity
This heap-based buffer overflow vulnerability is exploited by having a user open a maliciously-crafted file. In the wild, this exploitation has been used in order to establish command and control (over HTTP) with a target system. The command and control functionality has also been seen to employ debugging/sandboxing evasion.
MITRE CTID mapping of the KEV entry · follow-on activity
Command and ControlTA0011
Web Protocols T1071.001
MITRE CTID mapping of the KEV entry · primary impact
Lower-confidence links (1)
These come from early or generic mappings, text matching, or contradict this CVE’s details (for example a public-facing technique on a bug that needs a user to open a file). Shown for completeness.
- Malicious FileT1204.002 server-side bug exploitable without user interaction; client-execution technique does not fit
Detection
0 rules for this CVE · 43 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2015-3113 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Web ProtocolsT1071.00142 general rules
- Ursnif Malware C2 URL Patterncriticalstable
- HackTool - BabyShark Agent Default URL Patterncriticaltest
- PwnDrp Accesscriticaltest
- Ursnif Malware Download URL Patternhighstable
- APT User Agenthightest
- APT40 Dropbox Tool User Agenthightest
- Bitsadmin to Uncommon IP Server Addresshightest
- Bitsadmin to Uncommon TLDhightest
Debugger EvasionT16221 general rule
- PUA - Process Hacker Executionmediumtest
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 3 threat reports3 reportsUnit 42recon.cxMicrosoftFeb 2021 · 2 undated
Reports are matched by finding the exact id CVE-2015-3113 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
RECON MTL 2017 evolution of pirpi
Mentions the CVE; no further detail.
Microsoft Security
Mentions the CVE; no further detail.
2 passages name itOriginal (opens in a new tab) ↗
Also mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
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